Related by context. Frequent words. (Click for all words.) 57 single celled 56 unicellular 55 single celled organism 50 multicellular 50 organism 48 multicellular organisms 47 morphologically 46 prokaryotes 46 symbionts 45 carbon atom 45 Archaea 45 single celled organisms 44 nitrogen atoms 44 Petri dishes 44 amoebae 44 eukaryotes 44 convergent evolution 43 Amino acids 43 amoebas 43 cells 43 angiosperms 43 molted 43 archaea 43 photosynthetic 43 primordial soup 42 dinoflagellates 42 hybridized 42 mouse embryo 42 colonizes 42 hermaphroditic 42 nonliving 42 eukaryotic 42 motile 41 polypeptides 41 mycelium 41 transgenic mouse 41 alga 41 hybridize 40 unfertilized 40 gill 40 Petri dish 40 protozoa 40 placental mammals 40 cofactor 40 overexpressing 40 monolayer 40 mutated 40 mesenchymal cells 39 Mycobacterium 39 oviduct 39 asexual reproduction 39 bacterial colonies 39 diploid 39 carbon atoms 39 progenitors 39 pupa 39 zebrafish embryos 39 transfected 38 mycobacteria 38 monolayers 38 gut microbes 38 protozoan 38 intercellular 38 fibroblast cells 38 cells hESCs 38 organic inorganic 38 larval stage 37 petri dish 37 homologous 37 mouse embryos 37 crosslinking 37 overwintered 37 crystal lattice 37 Geobacter 37 Cambrian explosion 37 anaerobic bacteria 37 biosphere 36 hES cells 36 airlocks 36 Homo sapiens 36 cleaves 36 chemically inert 36 methylated 36 glioblastoma cells 36 evolutionary 36 incubated 36 thiol 36 culturing 36 symbiotic 36 translocated 36 petri dishes 36 reproducibly 35 substrate 35 nested 35 germ cells 35 functionalized 35 hatch 35 phylogeny 35 granule 35 primordial ooze 35 nanocrystalline