Related by context. Frequent words. (Click for all words.) 57 unfertilized eggs 54 sperm 53 ovulate 53 cloned embryo 53 oocytes 53 gametes 52 oocyte 52 fertilized eggs 51 copulate 51 matings 51 cryopreserved 50 cloned embryos 50 sperms 50 fertilize 49 germ cells 49 ovaries 49 asexual reproduction 49 spermatozoa 48 inseminate 48 reproduce 48 ovarian tissue 48 testes 48 ovary 48 pluripotent cells 48 reproductive tract 48 Wolbachia 47 fertilization 47 iPS cell 47 unfertilized egg 47 embryo 47 reproductive hormones 47 embryos 47 genetically diverse 46 inseminated 46 impregnate 46 procreate 46 estrus 46 metabolise 46 blastocysts 46 female hormone estrogen 46 tadpoles 46 somatic cells 46 mating 46 ES cells 46 eggs 46 mouse embryos 45 fertilized embryos 45 ejaculate 45 synthesise 45 uterine wall 45 SCNT 45 reproductive 45 conceive naturally 45 unused embryos 45 Fruit flies 45 regulate gene expression 45 fertilized 45 iPSCs 45 fertilising 44 artificially inseminated 44 offspring 44 ovarian function 44 absorb nutrients 44 stem cells 44 zebra fish 44 genetically identical 44 genetically modify 44 reprogrammed cells 44 neural stem cells 44 egg laying 44 reproductive biology 44 IVF treatment 44 larval stage 43 fallopian tube 43 genetically engineer 43 infertile 43 reabsorb 43 stem cells derived 43 genetically manipulated 43 pluripotent stem cells 43 hermaphrodites 43 therapeutic cloning 43 fertilized egg 43 embryonic cells 43 gobies 43 aneuploidy 43 Embryos 43 somatic cell 43 females 43 molt 43 cultured cells 43 genetically modified mice 43 larvae 43 culturing 43 testis 42 diploid 42 blastocyst 42 fledge 42 ovulation 42 hormone injections 42 cichlids