Every little helps.
D000818:Animals; D001706:Biopsy; D002467:Cell Nucleus / Q000378:metabolism; D002469:Cell Separation / Q000379:methods*; D010064:Embryo Implantation; D033041:Embryo Research / Q000941:ethics*; D004622:Embryo, Mammalian / Q000166:cytology* / Q000196:embryology; D005307:Fertilization in Vitro / Q000379:methods*; D006801:Humans; D051379:Mice; D013234:Stem Cells / Q000166:cytology*; D044465:White People