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(Click for frequent words.) 71 small RNAs 66 MiRNAs 65 MicroRNAs 62 Oct4 Sox2 60 FOLOTYN folate analogue 60 protein mTOR 60 Transcription factors 60 microRNAs miRNAs 58 copper zinc superoxide 57 Hemopurifier ® captures 55 VIDEO Egyptian mummies 55 named Gryposaurus monumentensis 54 Prion proteins 54 Hsp# [001] 54 microscopic single celled 54 tumor suppressor protein 54 proto oncogene 53 TORC1 53 Fragile X mental retardation 53 modulate sirtuins 53 Oct4 53 miRNA molecules 53 HOX genes 53 Terrorist explosives 53 Cathepsin B 53 Monoclonal antibodies 53 subventricular zone 52 Italy coul 52 single celled organisms 52 Sox2 52 renowned astrophysics observatory 52 Platelet Derived Growth 52 unicellular organisms 52 neurons astrocytes 51 deepest darkest abyss 51 bacterial enzymes 51 cnidarians 51 PKC enzyme 51 bio lipids 51 neural precursor 51 primary cilia 51 Wnt signaling pathway 51 naturally occurring neuroprotective 51 gamma amino butyric 51 epithelial stem cells 51 amyloid fibrils 51 kidney urologic 51 Sirtuins 50 Systemic lupus erythematosus 50 biological molecules 50 OCT4 50 p# deficient 50 nephronophthisis 50 mouse fibroblasts 50 ChR2 50 Alpha synuclein 50 parkin gene 50 metabolic enzymes 50 Astrocytes 50 porphyrins 50 Hoxb8 50 Mesenchymal 50 spermatogonial stem cells 50 Repenomamus robustus 50 enzymatic pathway 50 #beta HSD1 50 roundworms dominate 50 genetically mapped 50 cell nuclei 50 genetically reprogrammed 50 solitary locusts 50 regulates gene expression 50 Cytotoxic T 49 tiny tubules 49 methylation patterns 49 costimulatory 49 Umbilical cord stem cells 49 Hepatocytes 49 biological macromolecules 49 PluriCells TM 49 extracellular matrix ECM 49 Eodromaeus fossils 49 pluripotent embryonic 49 hedgehog signaling pathway 49 primordial germ cells 49 granule cells 49 Nanog 49 Macrophages 49 mutated Ras 49 glia cells 49 choroid plexus 49 MAPCs 49 single celled microorganisms 49 NKT cells 49 epigenetically 49 Leydig cells 49 carbenes 49 cell signaling pathway 49 peptide hormone 49 carbohydrate antigens 49 glial cells 49 chromosomal anomalies 49 Multipotent 49 multi celled organisms 49 GRNOPC1 contains 49 Htt 49 gamma globin gene 49 Ann Lucas Birle 49 Micro RNAs 48 cardiac fibroblasts 48 unspecialized cells 48 tumor suppressors 48 Pdx1 48 transformed peptic ulcer 48 mouse testes 48 multicellular organism 48 TGF alpha 48 Thorough cooking kills 48 IFNs 48 Wnt proteins 48 spermatogonial cells 48 secrete proteins 48 vascular endothelial cells 48 mesenchymal cell 48 genetically reprogram 48 Neural stem cells 48 receptor gamma 48 Glial cells 48 abnormal prions 48 Ancient tomb 48 naturally occurring protein 48 skim scour 48 multipotent 48 commercializing aptamer therapeutics 48 Wnts 48 podocytes 48 shoved burritos 48 Neuregulin 1 48 Progenitor cells 48 CB2 receptor 48 diagnosed Glioblastoma multiforme 48 embryonic germ 48 Prions 48 fatty molecules 48 mammalian prions 48 cellular prion protein 48 Mitotic kinesins 47 Membrane proteins 47 Lymphocytes 47 Quorum sensing 47 peptide antigens 47 Osedax worms 47 plastic hardener 47 fibrous tangles 47 primitive vertebrates 47 eighth Mersenne prime 47 basal cells 47 endocrine glands 47 Math1 47 pathological hallmark 47 indestructible BOB 47 documented Enriquillo fault 47 trophoblasts 47 HSPCs 47 proteins lipids 47 mammary cells 47 mollusks crustaceans 47 hammerhead ribozyme 47 Notch receptors 47 naturally occurring enzyme 47 Cota Monroy decapitated 47 insulin glucagon 47 genotoxic stress 47 cells secrete 47 somatic stem cells 47 Nasdaq LXRX biopharmaceutical 47 candidate ponatinib 47 monoclonal antibodies mAbs 47 induce pluripotency 47 Carcinoid tumors 47 Domoic acid 47 serpents hissed 47 Xenopus embryos 47 neural progenitor cells 47 WHIP FIP BABIP 47 outer membranes 47 manufacturing polyketide analogs 47 digest cellulose 47 human ESCs 47 axon guidance 47 PASADENA Calif. Astronomers 47 proteins 47 Genetic mutations 47 autoimmune encephalitis 47 myeloid cells 47 eicosanoids 47 ERK2 46 neural crest stem cells 46 vitellogenin 46 trap antimatter atoms 46 insulin secreting beta 46 pteropod 46 neuronal stem cells 46 epithelial tissues 46 Discoveries Tomorrow 46 develop selective androgen 46 EBx ® cells 46 crystallin 46 Treg cells 46 insect iridescent 46 Rhesus monkey 46 herpes viruses 46 Tumor suppressor genes 46 hook beaked lizard 46 oily pinkish brown 46 bioengineered mice 46 teratomas 46 GATA3 46 crocodiles turtles 46 β catenin 46 IKK2 46 fossilized creatures 46 Exosomes 46 thiopurine drugs 46 embryonic stem ES 46 SOD1 protein 46 Osteoclasts 46 adipose cells 46 misappropriating MGA trade 46 phenanthrene 46 Neu5Gc 46 hormone secreting 46 bioconjugation platform technologies 46 condition Arrhythmogenic Right 46 Intersex fish 46 AACR publishes five 46 Hematopoietic stem cells 46 biogenic amines occur 46 tumor suppressor genes 46 dinosaurs Yokoyama 46 mutant proteins 46 mesenchymal cells 46 oxidized lipids 46 Roger Tsien shared 46 overactivated 46 precancerous stem cells 45 luteal cells 45 cellular reprogramming 45 bought Glaxo Serevent 45 joint bookrunning underwriters 45 Epithelial 45 Ventricular Dysplasia 45 Embryonic stem cells ESCs 45 acinar 45 Nimbadon 45 Wnt signaling 45 Jaekelopterus 45 bone marrow lymph nodes 45 fibroblast cells 45 shape zeta 45 CombinatoRx periodically files 45 planarians 45 Wnt protein 45 manipulating atoms 45 Sox9 45 Shumyatsky 45 Dendritic cells 45 gene silencing mechanism 45 cytotoxic T lymphocytes 45 Nerve cells 45 Monsterstox.com tracks 45 hpSCs 45 Mitochondria 45 SOX3 gene 45 synovial cells 45 commercialize microRNA therapeutics 45 melanocyte stimulating hormone 45 blood clotting proteins 45 pDCs 45 synthesizing proteins 45 gene p# 45 secretory cells 45 Th# cells 45 mononuclear cells 45 hyperactivated 45 beak deformities 45 snatching evolutionarily advantageous 45 neural crest cells 45 Nanoshells 45 gastric carcinomas 45 human parthenogenetic stem 45 insulin secreting 45 leptin receptors 45 lunged baring 45 Airplanes sprayed 45 astrocytes 45 Fibroblasts 45 commercializing anti infective 45 Excessive dioxin levels 45 Amino acids 45 FSIS microbiological sampling 45 microbiological sampling 45 pluripotent human 45 lentiviral vectors 45 DDT PCBs 45 cytokine IL 45 germ cells 45 bone morphogenic protein 45 megakaryocytes 45 endoderm 45 mesenchymal stem cell 45 LSU Chakrabarty 45 45 skeletal muscle actin 45 neural cells 45 INFLUENCE GAME Govt 45 protein clumps 45 uncle Dawoud 45 Ramalho Santos 45 embryonic tissues 44 bone marrow stromal cells 44 Fruit flies 44 intestinal epithelium 44 kalirin 44 saber toothed vegetarian 44 Gleevec resistant 44 hematopoietic cells 44 naturally occurring proteins 44 goblet cells 44 Induced pluripotent stem cells 44 Neanderthal fossils 44 myopathies 44 jawless fish 44 Th2 cells 44 totipotent 44 microglial cells 44 gecko hairs 44 echinoderm 44 Hair follicles 44 dendritic cell vaccines 44 hMSCs 44 pancreatic islet beta 44 telomere dysfunction 44 abnormal proteins 44 progenitor cell 44 Botticella knows 44 L1 retrotransposons 44 Hh signaling 44 hematopoietic stem cells HSCs 44 egg follicles 44 enzymes 44 Europasaurus 44 superconductivity arises 44 molecular abnormalities 44 antigen presenting cells 44 multi celled 44 Pluripotent cells 44 CD8 T cells 44 glumly absorbed 44 Lauterbach charred corpse 44 Lymph nodes 44 Eosinophils 44 neural crest 44 mesenchymal 44 rxRNA TM compounds 44 Flavonoids 44 Ets2 44 Kufs disease 44 cells hESC 44 Sertoli cells 44 silencing RNA 44 epiblast stem cells 44 De Beers geologists 44 induced pluripotent 44 Sea otters 44 TGF ß1 44 Th2 cytokines 44 appointed Ambassador Extraordinary 44 Heterodontosaurus 44 monoterpenes 44 embryoid bodies 44 impertinent flamboyant endearingly 44 Frank Bisby 44 Skeletal muscle 44 transplanted embryonic 44 Epithelial cells 44 MIF protein 44 tool Jaenisch 44 defective mitochondria 44 cardiac myocytes 44 Fatty acids 44 beta islets 44 undifferentiated stem cells 44 Skeletal muscles 44 tarantula venom 44 decomposers 43 ROP# 43 Eaton ETN #/#/# PriceWatch 43 transgenic mouse 43 sodium selenite 43 habitable planets hints 43 aneuploid cells 43 centrosomes 43 vanEnglesdorp 43 C EBP alpha 43 immune cells 43 breast epithelial cells 43 Saqqara necropolis 43 amorphous silica 43 eastern cougar subspecies 43 reprogram adult 43 hES cells 43 Anthony Remijan 43 scuba diving approximated 43 Wheat gluten 43 mouse embryos 43 Quantum dots 43 mutant mouse 43 Hereditary angioedema HAE 43 neural stem cells 43 blastomeres 43 ionized molecules 43 Blackburn Greider 43 neurofibromas 43 demyelinated 43 ZFPs 43 germline stem cells 43 hair follicle stem cells 43 epigenetic changes 43 use hovering zeppelin 43 JAM Recruitment Ltd 43 embryonal 43 adult somatic cells 43 mites pesticides 43 Hematopoietic 43 Ina Caterina Remhof 43 single celled bacteria 43 intracellular pathogens 43 embryo clones 43 hES 43 neuroblasts 43 novel anticancer therapies 43 neural stem 43 Naked mole rats 43 chemically inactivated 43 Myostatin 43 HAR1 43 myofibroblasts 43 induced pluripotency 43 hematopoietic stem cells 43 Islet cells 43 deathly hallows anyway 43 luminal cells 43 Peripheral nerves 43 Elwyn Simons 43 mesenchymal stromal cells 43 Sift flour baking powder 43 Endrina Tay began 43 cats unfed 43 divide asymmetrically 43 induced pluripotent cells 43 discovered trapdoor spider 43 MDSCs 43 crystalline silicates 43 Adult stem cells 43 tholins 43 Enzymes 43 inhibiting enzymes 43 naturally occurring bacteria 43 neurotrophins 43 steam eruptions 43 erectus skulls 43 muscular dystrophies 43 technology cHTS 43 pancreatic endocrine 42 police inspector Dattatray 42 hemangioblasts 42 primordia 42 Cloning embryos 42 embryonic stem cells ESCs 42 Navy Cdr 42 Tumor cells 42 inventing RNAi therapeutics 42 pluripotent meaning 42 blastomere 42 urothelial cells 42 noncancerous cells 42 ACTCellerate ™ 42 lymphoma myeloma 42 haematopoietic stem cells 42 Denisovan 42 commercializing novel biotherapeutics 42 Langerhans cells 42 SATB1 42 chimeric embryos 42 ependymomas 42 mechanical deformations 42 within komatiitic extrusive 42 seminal vesicles 42 unfertilised 42 transgenic rats 42 Regenerative Cell 42 pancreatic islet 42 Asilisaurus 42 hypoxic tumor 42 heritable disorders 42 multipotent stem cells 42 hpSC 42 ectoderm 42 Nicole Kidman Jane Fonda 42 mature oligodendrocytes 42 embryonic stemcells 42 virally infected cells 42 vibrating strings 42 Parthenogenetic 42 endless bandhs 42 hESC derived 42 Juan Carlos Izpisúa Belmonte 42 Cytokines 42 digging scraping tilling 42 spermatogonia 42 metabolic byproducts 42 nitrogen fixers 42 parthenogenetic 42 induced pluripotent stem cell 42 reactive oxygen species ROS 42 degradative 42 fats proteins 42 lanternfish 42 melanoma tumors 42 microvessels 42 molecular diagnostics agricultural 42 VSELs 42 purines 42 known pika populations 42 cells hESCs 42 mouse embryonic stem 42 lung epithelial 42 Saturated fats 42 lineages diverged 42 called C'mere Deer 42 molecular pathway 42 pericytes 42 mesodermal 42 exocrine cells 42 genetically manipulating 42 lysosomal diseases 42 shrimplike 42 Multi Lineage Progenitor 42 Essential fatty acids 42 neural tissue 42 dendritic cells 42 IAC InterActiveCorp IACI PriceWatch 42 brainstems 42 Zebrafish 42 amino acid phenylalanine 42 divide uncontrollably 42 hematological diseases 42 barium strontium 42 hydraulically fracture shale 42 Hydrothermal vents 42 tendons cartilage 42 progenitor stem cells 42 Gliomas 42 Succinic acid 42 Alligators snakes 42 unspecialized 42 regenerating tissues 42 Basal cell carcinomas 42 immature dendritic cells 42 Arsenic occurs 42 Power3 applies 42 Neuroendocrine tumors 42 insects fungi 42 CD# + [001] 42 adult mesenchymal stem 42 multipotent adult 42 extracted mitochondrial DNA 42 nestin 42 Evolutionarily speaking 42 genetically engineered mouse 42 formalin fixed tissue 42 Aziz Rahman Tawab 42 anti convulsant carbamazepine 42 deriving synergies 42 nerve cells 42 bone marrow mesenchymal stem 42 cytotoxins 42 dedifferentiation 42 Encompassing isolation systems 42 air sacs alveoli 42 spermatogonial stem 42 exceptionally broadly neutralizing 42 bodily tissues 42 Marines manning checkpoint 42 Scorpion venom 42 rhino carcass 42 Mice genetically engineered 42 hydroxides 41 molecular biomarkers 41 genetically reprogramming 41 somatic cells 41 hematopoietic cell 41 tadpoles frogs 41 silicate rocks 41 chimeric mice 41 Genetic abnormalities 41 HSCs 41 boron compounds 41 PHI disclaims 41 medulloblastomas 41 Perchlorates 41 retinal pigment epithelium 41 Rubisco 41 Stable isotopes 41 undifferentiated cells 41 genetic alterations 41 Mass strandings 41 empty Eggo 41 multipotent cells 41 Spinal fluid 41 HISTORIC SITE Site 41 TUOIF 41 transplants CBTs 41 stromal cells 41 Fibronectin 41 hormone disrupters 41 Buckminsterfullerene 41 mice chipmunks 41 Geneticists 41 Russia Kamchatka volcanoes 41 hpSC lines 41 reimplanting sperm producing 41 Colon polyps 41 pickerel frogs 41 chlorine atoms 41 Radioactive tritium carcinogen 41 motor neurones 41 ISCO scientists 41 abzymes 41 endometrial regenerative cells 41 multiply uncontrollably 41 biology algal genomics 41 chemical acetylcholine 41 Markieff Morris cried 41 pluripotent cells 41 suppresses tumor 41 photosynthetic apparatus 41 CRTC3 41 Homo ergaster 41 hatched chick 41 SMN protein 41 bioaccumulates 41 exo planets 41 tinged pelicans 41 thymosin 41 hominoid 41 cybrids 41 buckminsterfullerene 41 Insecticidal soaps 41 cone photoreceptors 41 micrometers millionths 41 neural stem cell 41 judged unobtainable 41 skeletal muscle cells 41 anticancer therapy 41 neurotrophic factors 41 Chanting Kill 41 mitochondrial mutations 41 Carbon nanotubes 41 hormone estrogen 41 Hunter OTCBB URHN 41 trophic factors 41 Steven Hatfill physician 41 Outperform Perform Underperform 41 cosmology quantum 41 Influenza viruses 41 furiosus 41 Susan Stroman directs 41 Neutrophils 41 fossilized dinosaur eggs 41 chondrocytes 41 zebrafish embryos 41 Mesenchymal Stem Cells 41 retrovirus 41 Stem cells 41 immunodeficient mice 41 bone marrow derived mesenchymal 41 Bone marrow stem cells 41 mesothelium 41 mycelium 41 Stern overmedicated 41 Shanieka Y. Ward 41 HIPAA Gramm Leach Bliley 41 granule neurons 41 Soot particles 41 induced pluripotent stem iPS 41 oligodendrocytes 41 hES cell 41 CBS SportsLine.com wire 41 telomerase gene 40 placental cells 40 beta islet cells 40 holoprosencephaly 40 transdifferentiation 40 produce microscopic spherical 40 ketone bodies 40 insulin secreting cells 40 embryonic tissue 40 hematopoietic stem cell 40 hematopoietic 40 Glioblastoma multiforme GBM 40 gastrointestinal stromal tumors 40 pancreatic tissue 40 Mesenchymal stem cells 40 pancreatic cells 40 Gamma ray burst 40 Ildstad 40 granulosa cells 40 chemosynthesis 40 cholinergic neurons 40 Keith Bildstein 40 reprogramming genes 40 corneal cells 40 T. reesei 40 virulent toxin 40 blood clotting protein 40 speak Singlish 40 chemical attractants 40 salps 40 humic acids 40 Pakasuchus 40 macrofauna 40 pluripotency 40 worthwhile Schwehm 40 S. aureus bacteria 40 exosomes 40 Neanderthal teeth 40 synaptic function 40 iron sulfide 40 harmful reactive oxygen 40 Circadian clocks 40 Columbian mammoths 40 grizzlies roam 40 Ayyubid rulers 40 Blastocysts 40 cell enzymes metabolize 40 clonogenic 40 Cysts 40 haematopoietic cells 40 mouse neural stem 40 endothelial progenitor cells 40 pureeing vegetables 40 Sascha Schmidt 40 adipose derived stem cells 40 titanium zirconium 40 genetically modified mice 40 regenerative biology 40 algaes 40 collagen VI 40 HIV mutates 40 Eaten raw 40 Isaac Wirgin 40 filter feeders sucking 40 hematopoietic blood 40 cadmium accumulates 40 radioactive nuclei 40 retroviral vectors 40 keratinocyte 40 endangered Steller sea lions 40 brown pelicans gulls 40 Behn advises 40 immiscible 40 emits photon 40 stem cells CSCs 40 SCN9A 40 icelike 40 glucuronolactone 40 planktons 40 stem progenitor cells 40 progenitor cells 40 neurites 40 antibodies 40 enucleated 40 haematopoietic stem cell 40 neurotrophic 40 inorganic minerals 40 tissue homeostasis 40 mesenchymal stem cells 40 chronic granulomatous disease 40 myoblasts 40 Antioxidant supplements 40 hobbit sized 40 Regenstrief Institute affiliated 40 used medicinally 40 brown dwarfs stellar 40 earliest hominid 40 transplanted bone marrow 40 Malignant tumors 40 pollinating plants 40 induced pluripotent stem cells 40 suggested desalinating sea 40 angiogenic 39 Glioblastomas 39 spermatagonial cells 39 suberin 39 Twitter quitters outnumber 39 Donald Olander 39 Sudbury Aqueduct 39 Dig unearths 39 Chronic lymphocytic leukemia CLL 39 spokeswoman Tisha Petteway 39 HepDirect R 39 breast cancer metastasis 39 contaminating waterways 39 hematopoietic progenitor cells 39 factor PlGF 39 immunologists 39 mesenchymal stem cells MSCs 39 mammalian embryo 39 Visit www.americanhumane.org 39 sauteed lamb 39 Ketones 39 biologists geneticists 39 largest pallasite meteorite 39 myostatin 39 netrin 1 39 antioxidants vitamins minerals 39 stemness 39 concentration camps Gonsalves 39 tetrapods evolved 39 herring sardines albacore tuna 39 mesenchymal progenitor cells 39 umbilical hernias 39 Cloned embryos 39 diagnosed glioblastoma 39 pancreatic tumors 39 adipose stem cells 39 adipose derived 39 Progenitor Cells 39 honey dew 39 Immune cells 39 cardiac arrest oxygenated blood 39 somites 39 What bothers Eriacho 39 % Caprylate Chromatography 39 congenital brain tumor 39 molecular mechanisms regulating 39 lymphocytes 39 ependymal cells 39 parthenogenetic stem cells 39 hESCs 39 drifting cottonwood fluff 39 B lymphocytes 39 deteriorated evaporated 39 methane CH4 39 retinal stem cells 39 pluripotent stem cell 39 Aromatase inhibitors 39 stimulating unfertilized eggs 39 myeloma cells 39 Apparent malfunction 39 muscle dystrophies 39 Schwann cells 39 nanocarriers 39 Disposable Transducers Markets Independently 39 filamentous algae 39 bumbling moron 39 ES cells 39 telomerase enzyme 39 aneuploid 39 diamonds Kroto 39 Envoy Therapeutics 39 Rumana village 39 acinar cells 39 rodents seeping 39 Embryonic cells 39 lung fibroblasts 39 catalytic reactions 39 dyskeratosis congenita 39 Acute myeloid leukemia AML 39 Bornean wildlife 39 Scientists theorized 39 petrodollar transfers 39 Jackson musical Sisterella 39 targeting renin 39 Archeologists unearthed 39 paleobotany 39 Tumours 39 sialic acids 39 supercritical fluids liquids 39 lumican 39 teratoma 39 C. crescentus 39 Goldbrook quest 39 Bone marrow derived 39 Circulating tumor cells 39 benzene formaldehyde 39 parthenogenetic cells 39 fossilized dinosaur bones 39 nutria ate 39 Pallid sturgeon 39 Bald eagles nest 39 cells PBMC 39 placental tissue 39 á ¿ † 39 neurotrophin 39 factor NGF 39 Mix cornstarch 39 transplanted corals 39 reprogrammed stem cells 39 mental retardation epilepsy 39 wounded squatted helplessly 39 Horvitz assembled 39 Tropical rainforests 38 terminally differentiated 38 potassium sodium 38 Benign tumors 38 motor neuron diseases 38 Woolly mammoth 38 fossilized specimens 38 naturally occuring 38 snowmelt lessened 38 sulfate minerals 38 Sulfates 38 Menstrual blood 38 birdlike dinosaur 38 tumor specific antigen 38 Snake venom 38 Telomerase 38 Mesenchymal cells 38 physicists mathematicians 38 manning checkpoints drunk 38 cardiac progenitor cells 38 cavewomen 38 Christoffel Teeuwissen 38 Dr. Rafii 38 retinal cells 38 Rasenick 38 skeletal muscle tissue 38 secrete mucus 38 gall wasps 38 exempt hookah lounges 38 visit Touthouse.com 38 Embryonic stem cells 38 Pluripotent 38 partial skeleton 38 Dr. Randy Jirtle 38 leukemic stem cells 38 Salmonella bacteria 38 San Sebastiano cemetery 38 Hypochlorite 38 fibroblasts 38 Biological Studies 38 molecularly identical 38 NK cells 38 subsurface cracks 38 Utah redrock country 38 libido boosters 38 Famil Aug. 38 epicardium 38 nerve sheath 38 Cost INTEREST EARNING 38 thymus 38 loaded semiautomatic handguns 38 mouse embryo 38 vapors emitted 38 TH# cells 38 rickety deathtraps waiting 38 DOE DOD 38 magma mixing 38 physicists astronomers 38 myocytes 38 Explor disclaims any 38 TROUT UNLIMITED Hendersonville 38 placoderm 38 deformed beaks 38 Follow LiveScience 38 PDGF CC 38 magnesium selenium 38 met Camilla Shand 38 microscopic bugs 38 granulocytes 38 concentration gradient 38 historian Dee Brecheisen 38 dermal papilla cells 38 Further Cytiva disclaims 38 rediscovering Machu Picchu 38 mesothelial cells 38 called gravitational microlensing 38 matter antimatter asymmetry 38 panther kittens 38 gatekeepers issuing 38 Nitric oxide 38 stained plumage 38 basalt volcanic 38 epithelial cells 38 Mammalian cells 38 IPSCs