Related by context. All words. (Click for frequent words.) 61 embyros 58 unfertilised 58 unfertilised eggs 58 frozen IVF embryos 58 IVF embryo 58 cumulus removal 57 ovulates 57 invitro fertilization 56 implanted embryos 56 fertilized eggs implanted 55 octuplets conceived 55 amniotic cavity 55 chromosomally normal 55 ovary tissue 54 mature oocytes 54 sperm donor offspring 54 savior sibling 54 fertilized ova 54 tube fertilization 54 ovulation fertilization 54 spontaneously aborted 54 fertilising eggs 54 embryo clones 54 frozen thawed 53 Hoerstrup 53 fertilized embryo 53 defective mitochondria 53 inhibiting ovulation 53 IVF embryos 53 spontaneously abort 53 chromosomally abnormal 53 engineered bladders 53 eggs fertilized 53 Vitro Fertilisation 53 Natallie 53 Khloe Kardasian 53 Natallie Evans 53 gametes sperm 52 stem cells harvested 52 ovarian transplant 52 Cryopreservation 52 Preimplantation Genetic Diagnosis PGD 52 Dr Taranissi 52 Brucellosis causes 52 artificially inseminate 52 implanting embryos 52 frozen embryos implanted 52 oviducts 52 drug clomiphene 52 cloned primate 52 Fertilized eggs 52 Octuplets mom identifies 52 thawed fertilized 51 transplanted ovarian 51 inseminated 51 artificially inseminated 51 deformed fetuses dying 51 Blastocysts 51 Dr. K. Muhunthan 51 clone embryos 51 placental tissue 51 spermatagonial cells 51 spermatogonial stem cells 51 intra uterine insemination 51 surplus IVF embryos 51 cryopreserved embryos 51 artificially impregnated 50 cloned embryo 50 reimplanting sperm producing 50 fetuses aborted 50 embryos 50 aborted fetal 50 IVD sperm 50 IVF treatment 50 Dr Zavos 50 inseminate 50 IN VITRO 50 ivf 50 donor gametes 50 egg follicles 50 Cloned cow 50 unfertilized mouse 50 name Cetrotide R 50 uterus fallopian tubes 50 ovaries uterus 50 Asome news 50 oocytes eggs 50 suppressing ovulation 50 artificially inseminating 49 miscarried fetuses 49 Fallopian tube 49 reproductive tracts 49 fertilized eggs 49 cumulus cells 49 sperm fertilizes 49 Verlinsky 49 intracytoplasmic sperm injection 49 mouse testes 49 Sertoli cells 49 intrauterine insemination IUI 49 embryologists 49 amniotic stem cell 49 fertilized egg implanted 49 unfertilised egg 49 vitro maturation 49 induce contractions 49 ovulated 49 cryosurgery freezing 49 amniotic fluids 49 vitro maturation IVM 49 preimplantation genetic diagnosis PGD 49 gamete 49 aneuploid 49 embryo 49 Therapeutic cloning involves 49 unfertilized human 49 semen ova 49 umbilical cord stem cells 49 bone marrow derived mesenchymal 49 pluripotent embryonic 49 implanting Nadya Suleman 49 fertilized 49 transplanted ovary 49 fertilized embryos 49 Pre implantation genetic 49 stem cells extracted 49 intra cytoplasmic sperm 49 doctor Severino Antinori 48 eggs oocytes 48 cryogenically stored 48 Male infertility 48 Dr. Zev Rosenwaks 48 Prometea 48 growth hormone rBGH 48 hormone FSH 48 zygotes 48 anencephalic 48 Elonva 48 partially eviscerated 48 cryo preservation 48 Severino Antinori 48 SpermCheck 48 immunologically compatible 48 athymic mice 48 tenderly kiss 48 Northridge Moschella 48 IVF ICSI 48 Taranissi 48 primordial germ cells 48 leftover embryos 48 chick embryos 48 cloned blastocysts 48 artificial wombs 48 Infertile 48 intracytoplasmic sperm injection ICSI 48 heel prick test 48 Indira Hinduja 48 vitro fertilization artificial insemination 48 parthenogenic 48 chemistry microbiology immunology 48 excess IVF embryos 48 embryo implants 48 applied vaginally 48 Cloning embryos 48 preimplantation genetic diagnosis 48 clomifene 48 reproductive biologist 48 embryo cryopreservation 48 cloned mammal Dolly 48 babies umbilical cords 48 seminal vesicles 48 rotifer 47 Molly Thornberg 47 oocyte retrieval 47 enucleated 47 Kamrava implanted Suleman 47 egg retrieval 47 mammal cloned 47 cow rumen 47 cryogenically preserve 47 donor trachea 47 thymus tissue 47 menstrual periods indefinitely 47 Reproductive cloning 47 gene expression Sapienza 47 embryo implantation 47 Milan Hayat Stapp 47 embryonic tissue 47 Gab Kovacs 47 embryonic stemcells 47 brood pouch 47 Panayiotis Zavos 47 Clostridium bacteria 47 Bethenny Frankel mugged 47 transfusion syndrome 47 Gestational age 47 subfertile 47 Octuplet mom fears 47 conceives twins 47 Umbilical cord stem cells 47 prevent fertilized egg 47 infertile 47 preimplantation genetic 47 gibbon ape 47 inseminating 47 undergoing IVF 47 products Cumulase R 47 cryo preserved 47 FSH follicle stimulating 47 parthenogenetic 47 reimplanted 47 Domasin 47 protein hydrolyzate formula 47 Massospondylus 47 Depo Provera injections 47 infertility miscarriages 47 oocyte donation 47 cryopreserved 47 mealworms carpenter bees 47 Infertile couples 47 Preimplantation genetic diagnosis 47 Prolacta Bioscience 47 cultured stem cells 47 neo bladder 47 fertilized egg 47 RhD negative 47 oocyte cryopreservation 47 sized gland 47 Rhesus monkey 47 Sumatra tiger cub 47 Dr. Loeken 47 SEQureDx ™ 47 vero cells 47 ulipristal 47 Umbilical cord 47 fruitfly Drosophila 47 zona pellucida 46 neo natal ICU 46 embryo implanted 46 Werker tested 46 Lawyer Octuplets mom 46 Mycoplasma capricolum 46 invitro 46 unfertilized eggs 46 breech babies 46 donor windpipe 46 totipotent 46 thawed ovarian 46 regenerative biology 46 laminaria 46 transgenic pigs 46 unfertilized egg 46 Breastfeeding moms 46 woman ovulates 46 nipples testicles scrotum 46 dialed Ybarra 46 collapse Betsy Sathers 46 placental cells 46 stillborn infants 46 cancerous ovary 46 ovarian follicles 46 frozen embryos 46 Chantelle Stedman 46 Gabriela Cezar 46 silver coated endotracheal 46 CARE Fertility 46 matchstick sized 46 pluripotent human 46 artificial gametes 46 Board probes octuplet 46 frozen embryo 46 discarded umbilical cords 46 extracted mitochondrial DNA 46 intra uterine insemination IUI 46 spare IVF embryos 46 egg retrievals 46 Mohamed Taranissi 46 Karin Michels 46 vitro treatments 46 emerging contaminants radiochemistry 46 ovulation induction 46 fetal tissue 46 immature oocytes 46 Dr Rashbrook 46 Darlene Haynes womb 46 nicked Dorn 46 cloned stem cells 46 Intra Cytoplasmic Sperm Injection 46 blood semen vaginal 46 Kirichok 46 miscarrying 46 MizMedi 46 diagnosis PGD 46 HRA Pharma reduces 46 Artificial pancreas 46 fibroid tumor 46 artificial inseminations 46 virile reproductive 46 progesterone hormone 46 ovulatory cycles 46 uterus cervix 46 blastomere 46 Dr Allan Pacey 46 cultured neurons 46 transfuse blood 46 transfer SCNT 46 Multipotent 46 ovarian follicle 46 Airboats evacuated 46 Nadya Suleman NAH' dee 46 Panos Zavos 46 Follicle Stimulating Hormone 46 follicular fluid 46 genetically reprogrammed 46 dress skimpily 46 Lun Lun LOON LOON 46 Pursinger 46 HeLa cell 45 Bergholdt 45 Nature DOI #.#/nature# 45 breastfeeds Sierra Leone 45 donor insemination 45 hMG 45 Lactating mothers 45 transplanting organs 45 unused embryos 45 placental stem cells 45 deriving stem cells 45 cloned camel 45 IVF 45 LifeCell Dx 45 donor sperm 45 chemically inactivated 45 iPS derived 45 bio photonic 45 luteal cells 45 vacuum extractor 45 ovules 45 Pre eclampsia affects 45 uterine fibroid tumors 45 Britain Human Fertilization 45 cloning embryos 45 fine needle aspirate 45 blacktip reef shark 45 gastroenterology obstetrics gynecology 45 noncancerous growths 45 transplanting insulin 45 induce ovulation 45 Hair follicles 45 Mandy Allwood 45 intra uterine 45 oophorectomy removal 45 human antithrombin protein 45 amniotic fluid donated 45 mother Darlene Haynes 45 hormone hCG 45 addition HANABI automated 45 germline stem cells 45 spider silk proteins 45 secretes insulin 45 elective Caesarean section 45 ovaries fallopian tubes 45 stem cells MSCs 45 preeclamptic women 45 surrogacies 45 Chromosomal abnormalities 45 researchers implanted electrodes 45 human chorionic gonadotrophin hCG 45 albino rats 45 stabilized hyaluronic acid 45 underwent fertility treatments 45 Embryo mix 45 hormonal stimulation 45 banning reproductive cloning 45 antral follicles 45 ovariectomized 45 ovary transplants 45 mammalian embryos 45 female hormone progesterone 45 placentas 45 MediVet 45 cesarian section 45 mucus clogs 45 Preimplantation Factor 45 Anne Drapkin Lyerly 45 Ovarian Tissue 45 artificial insemination 45 embryonic tissues 45 spiders ants silkworms 45 Angela Magdaleno 45 undergoing hematopoietic stem 45 induce abortions 45 produced synthetically 45 conjoined twin dies 45 recently shampooed powdered 45 marine microalgae 45 semen 45 addition RTI pastes 45 Shady Grove Fertility 45 Gruessner 45 Circumcising 45 Tracy Lagondino 45 recombinant spider silk 45 Dr Patricia Rashbrook 45 stimulate ovulation 45 friend Jaymes Foster 45 hypoallergenic formula 45 abnormal chromosomes 45 stemcell 45 petrie dish 45 vernix 45 ovum 45 Cumulase 45 HLA markers 45 leukapheresis 45 cloning Dolly 45 metabolomic profiles 45 mitochondrial DNA sequence 45 cryogenically preserved 45 De Croock 44 ovary uterus 44 vaginal fluids 44 Rebecca Bresnik meanwhile 44 Fertility clinics 44 Cryozootech 44 BSE prions 44 gestational sac 44 colostrums 44 Bremerhaven zoo 44 inseminations 44 premalignant cells 44 Mrs Adeney 44 Umbilical cords 44 pill ella 44 cria 44 abnormal cervical 44 umbilical cord attached 44 fetal nucleic acids 44 adult somatic cells 44 Foetuses 44 Bhateri 44 morula 44 Nadya boyfriend 44 carbohydrates electrolytes calcium 44 trophoblast 44 triplet pregnancy 44 Alessio Fasano 44 vitro fertilization 44 ovarian tissue 44 rhesus macaque monkeys 44 vaginal cavity 44 infertile couples conceive 44 Innermost Secrets 44 Embryo 44 Beckwith Wiedemann syndrome 44 ovule 44 Geoffrey Sher 44 embryos implanted 44 Parthenogenetic 44 gametes 44 testicular sperm 44 sodium selenite 44 Bhateri Devi 44 Rhesus disease 44 fennec foxes 44 male reproductive organs 44 Dr Nayna Patel 44 MENOPUR 44 gonadotrophin 44 IUD inserted 44 Cetrotide R cetrorelix 44 DuoFertility 44 Hashmis 44 perinatally 44 fertilization clinics 44 acrosome reaction 44 cell culturing 44 rendered infertile 44 Atryn 44 morally licit 44 Synchrony lens 44 Eylau Centre 44 Vol Message 44 cryogenic preservation 44 Extracting stem cells 44 Rouge Barbaro 44 Extend Fertility 44 trachea transplant 44 reproductive endocrine 44 amniotic epithelial cells 44 epiblast 44 mucous membrane lining 44 suppresses ovulation 44 spermicides 44 Ella Milbank Foshay 44 unfertilized egg directly 44 Premarin estrogen 44 telltale symptom 44 Embryology Act 44 genetically engineered yeast 44 controlled ovarian stimulation 44 Embryonic stem cells ESCs 44 newborn piglets 44 StemLifeLine 44 fertilize eggs 44 pesticide metabolites 44 sperm 44 HRC Fertility 44 MicroSort 44 vitro pregnancies 44 facilitates umbilical cord 44 Thorough cooking kills 44 Anjelica Twillie 44 Cryobank 44 ovary 44 mutated BRCA 44 growth hormone rBST 44 Royan Institute 44 non mutated KRAS 44 Ultrasonographic 44 abort fetuses 44 rectal suppository 44 gestational surrogate 44 crias 44 implantation genetic 44 reimplanting 44 thy womb 44 cloned mule 44 Rh factor 44 Regenerative Cell 44 Leydig cells 44 Bearded seals give 44 Xenopus laevis 44 proximal tubules 44 Skutella 44 mesenchymal stem cells MSCs 44 aborting fetuses 44 uterine arteries 44 Apert syndrome 44 Beverly Hills fertility 44 radioactively labeled 43 vaginal secretions 43 cisplatin resistant 43 transgenic zebrafish 43 bantengs 43 Morells embryo 43 abdominal cavities 43 certified reproductive endocrinologist 43 mouse embryos 43 extracting stem cells 43 tubal ligation reversal 43 testicular biopsy 43 pediatric endocrinology urology orthopedics 43 Eleanor Nicoll spokeswoman 43 Hormonal contraceptives 43 ICSI intracytoplasmic sperm 43 insect larva 43 estrus cycle 43 BRAF gene mutations 43 Giulio Cossu 43 fertility 43 cytoplasmic hybrid 43 blastomeres 43 spores germinate 43 artificially inseminated Lun Lun 43 Veterinary Genetics 43 secrete proteins 43 hormone androgen 43 stemcells 43 ACTCellerate ™ 43 Shahana Hashmi 43 engineered urethras 43 undergone tubal ligation 43 stimulates ovulation 43 M. anisopliae 43 freezeREV 43 Dr. Chantal Caviness 43 Boreal Genomics 43 uterus 43 Kailas Gheewala 43 buffy coat 43 Eluana Englaro feeding 43 rectal palpation 43 mammary cells 43 undergone hysterectomy 43 CatSper 43 Seang Lin Tan 43 pancreatic tissue 43 TEL AML1 43 Embryos 43 somatic cell 43 Cryos 43 NMP# protein 43 separated conjoined 43 lymphatic vasculature 43 nasal ointment 43 denies fathering 43 pigtail macaques 43 Touirat 43 BanLec 43 Fetal distress 43 lutropin alfa 43 sex hormones androgens 43 cloning pioneer 43 semen sample 43 granulosa 43 scrapie infected 43 PGD PGS 43 undergone fertility treatments 43 diethylstilbestrol 43 cadmium accumulates 43 vasectomy reversal 43 protein biochips 43 Clearblue 43 discodermolide 43 hormones progesterone 43 diagnostic biomarker 43 bdelloid rotifer 43 transplanting kidneys 43 artificial insemination AI 43 surgically implanting 43 blastocyst 43 frozen semen 43 Xenopus 43 lactating sows 43 blastocysts 43 boar semen 43 detectable BPA 43 mammalian sperm 43 drain excess cerebrospinal 43 Placental 43 hairless mice 43 Gianvi 43 diethylstilbestrol DES 43 artery embolization 43 pre implantation genetic 43 Study Spacing 43 ViaCyte 43 Matschie tree kangaroo 43 hormone progestogen 43 RNL BIO 43 hysteroscopy 43 Edinburgh Roslin Institute 43 Evelyn Intondi Planned Parenthood 43 peeled carrots 43 HESCs 43 bottle nipples 43 bacterium Listeria 43 patent ductus arteriosus PDA 43 underdeveloped kidneys 43 pasteurise 43 undifferentiated stem cells 43 Lancelot Encore 43 Culling embryonic stem cells 43 involves implanting 43 anesthesia neuroanatomy obstetrics 43 fallopian 43 panther cubs 43 Irradiating 43 Vitro Fertilization IVF 43 multipotent adult 43 allogeneic endothelial cells 43 amniotic fluid stem cells 43 II nicknamed Blanket 43 Mohammed Taranissi 43 RISUG 43 anatomist Gunther von Hagens 43 Islet cells 43 undergone mastectomy 43 genome decoded 43 ethically unjustifiable 43 LH FSH 43 hESC derived cardiomyocytes 43 chimerism 43 Inovio proprietary 43 gamma globin gene 43 Naked mole rats 43 IUGR 43 cynomolgus macaques 43 Arletta Bendschneider 43 Plaintiff Jana Beighle 43 annelid worms 43 sorting FACS 43 male pipefish 43 erectile tissue 43 Masai giraffes 43 side blotched lizards 43 unfertilized 43 cloned goat 43 Escherichia coli E.coli 43 Ecmo 43 molar pregnancy 43 STK# gene 43 Booger genuine 43 covalently bound 43 pituitary glands 43 haematopoietic stem cell 43 Wisconsin Veterinary Diagnostic 43 miscarried 43 primordial follicles 43 biliary atresia rare 43 National Birth Cohort 43 Amillia Sonja Taylor 43 pesticides synthetic fertilizers 42 custom SoCs ASICs 42 pharmacist Trupti Patel 42 bioactive molecules 42 arbitrarily hastened 42 spermatozoon 42 Serratia bacteria 42 reproductive abnormalities 42 identical triplet 42 penile erectile tissue 42 foaling mares 42 gastrostomy 42 undergone gender reassignment 42 vaccinated DeYoung 42 chicks hatching 42 ovarian torsion 42 chorionic gonadotropin 42 cloned piglets 42 HLA identical 42 lactating dairy cows 42 marmoset embryos 42 laboratory 42 fertilized ovum 42 cervical secretions 42 fertilises 42 transgenic goats 42 Sperm donor 42 histone demethylase 42 reinfusion 42 hypoxic ischemic encephalopathy HIE 42 uterine cavity 42 uterine tumors 42 Kathy Giusti myeloma 42 Preeclampsia affects 42 VolChat 42 prenatal diagnostic 42 spontaneous miscarriages 42 McGill Reproductive 42 pregnant 42 reinfused 42 yolk sac 42 Expectant mum 42 oral rotavirus vaccine 42 Reproductive Biology 42 breastfeeds 42 copulated 42 somatic stem cells 42 Stephanie Yarber 42 Embryology Authority HFEA 42 uterine artery 42 mimics estrogen 42 conceptus 42 Nasal spray flu 42 Reproductive Medicine Associates 42 transgenic rats 42 Certified nurse midwives 42 Soluble CD# 42 umbilical cord stem cell 42 female reproductive organs 42 genetically defective 42 cloned embryos 42 Fertility Clinic 42 IntegraMed fertility practice 42 Aborted fetuses 42 insulin secreting beta 42 umbilical stump 42 malignant polyp 42 Fauza 42 singleton pregnancy 42 suppress ovulation 42 Speranzas 42 Tissue Biology 42 Rb gene 42 rat pups 42 pig islets 42 biotechnologist 42 granulosa cells 42 Deuel weighed 42 Shellcrackers Fair using 42 Nic Bening 42 byproduct cyanuric acid 42 cervical cancer jab 42 phthalate syndrome 42 amnion 42 admixed embryos 42 tubal 42 blighted ovum 42 bottles dental sealants 42 mammary tissue 42 babies 42 Hirschsprung 42 genetically identical 42 gestated 42 Patricia Rashbrook 42 guinea pigs rabbits 42 synthetic progesterone 42 intraperitoneal injection 42 intrauterine insemination 42 chorionic villus 42 stabbing Wilkinsburg 42 Dr. Mandhir Gupta 42 placenta umbilical cord 42 embryonic stem cells ESCs 42 recombinant follicle stimulating 42 penis vagina breast 42 Dr Armellin 42 involves swallowing Mifeprex 42 female gamete 42 Laird Vonne Stone 42 trophoblasts 42 sperm cryopreservation 42 Yury Verlinsky 42 mouse mammary 42 Cleo Buckman Schwimmer 42 Induced pluripotent stem cells 42 contraceptive Pill 42 nonviable Ellner 42 prolapses 42 Adriana Iliescu 42 impregnate 42 gestational surrogates 42 stem cell engraftment 42 Dr. Irving Weissman 42 embryologist 42 ovulation inducing 42 imperforate anus 42 Dr Mandhir Gupta 42 IVF PGD 42 GRNOPC1 contains 42 Africa McCalop 42 vitro fertilization clinics 42 NIBSC 42 reimplant 42 ovulate 42 caesarean section births 42 PEG tube 42 X. tropicalis 42 liver regenerates 42 cloning Cibelli 42 haematologists 42 synthetically engineered 42 maternal serum 42 candor Carrie Rickey 42 Kamrava implanted dozen 42 Sheryl Crow adopts 42 tapeworm eggs 42 earlier Dorlean Nadege 42 microchimerism 42 vaginal canal 42 Suleman implanting 42 Nayana Patel 42 pelvic anatomy 42 liquid nitrogen tanks 42 prostate glands 42 Pueraria 42 gonadotropins 42 sex hormones estrogen 42 prevent hemolytic 42 formalin fixed 42 RMACT 42 purebred Holstein 42 Added Tomtishen 42 Contraceptive pill 42 tubal reversal 42 hysteroscope 42 prenatal checkup 42 Conjoined twins occur 42 Colostrum 42 BANG Lindsay Lohan 42 solitary locusts 42 Feedstock consists 42 passaged 42 female reproductive tract 42 Hoxb8 42 female hormones estrogen 42 cloned 42 anonymous sperm donor 42 implanting Suleman 42 oatmeal cereal 42 baby 42 embryo experimentation 42 kidney liver pancreas 42 BioArchive System 42 abort fetus 42 reproductive endocrinologist 42 umbilical stem cell 42 injection ICSI 42 IVF clinics 42 Ikufumi Yamada 42 autologous transplant 42 baker yeast Saccharomyces cerevisiae 42 marrow cavity 42 alpha lactalbumin 42 fumed Arthur Caplan 42 Ellen Vitetta 42 Sirtex SIR Spheres microspheres 42 clog intravenous 42 prion gene 42 elective caesarean 42 vaccinated dewormed 42 Spinal fluid 42 cervical prostate 42 preeclamptic 42 extract stem cells 42 genetically manipulating 42 Rh positive 42 thale cress Arabidopsis thaliana 42 conjoined Egyptian 42 Without functional ribosomes 42 conceive naturally 42 gonadal 42 adipose stem 42 human ESCs 42 germline stem cell 42 Western lowland gorilla 42 Thoroughly cooking eggs 42 vessels constrict 42 bob veal 42 pregnancies Tilton Durfee 41 embryo transfers 41 primary immunodeficiencies 41 vitro 41 premie 41 FIV FeLV 41 Reproductive Ethics 41 Metabolic Screening 41 human chorionic gonadotrophin 41 COPEGUS therapy 41 haematologist 41 weighed #.#kg [002] 41 Tunstall fetus 41 Ramses II mummy 41 orangutans chimpanzees 41 kills mosquito larvae 41 hatched chicks 41 mice ferrets 41 prevents ovulation 41 neonatal lupus 41 reabsorbs 41 nurse Ysasaga 41 marrow reprogram 41 germline cells 41 neo natologist 41 chimeric embryos 41 congenitally deformed 41 malignant tissues 41 Symyx microscale parallel 41 reuteri 41 uterus didelphys 41 ovary stimulating 41 Menstrual blood 41 trouble conceiving 41 surfactant therapy 41 monozygotic 41 induced pluripotent stem cell 41 primordia 41 miner Ariel Tiscona 41 Enterobacter sakazakii 41 prescribe contraceptives 41 serratia 41 Baby Fae 41 nonconsensual termination 41 congenital toxoplasmosis 41 ovary transplant 41 removed laparoscopically 41 undeveloped conjoined twin 41 asexually 41 Alan Copperman 41 enucleated egg 41 pre eclamptic 41 spayed vaccinated 41 prostatic fluid 41 bodily tissues 41 sperms 41 ferrets nasal cavities 41 oocyte 41 embryo biopsy 41 vitro Fertilization 41 Islet cell 41 inspect vials 41 Maria Leadbeater 41 Royana 41 manager Connie Freiberg 41 recombinant bovine somatotropin rbST 41 Vitro Fertilisation IVF 41 Arnold Kriegstein MD PhD 41 ACE inhibitors dilate 41 Gaga Gaga 41 mitochondrial DNA mtDNA 41 CXR Biosciences 41 prevents fertilized egg 41 gunshot residues 41 thyroid hormone deficiency 41 accomplice Hudgens 41 Prof Nayernia 41 preimplantation