Embryos.
D033041:Embryo Research; D004622:Embryo, Mammalian; D005314:Embryonic and Fetal Development; D006801:Humans; D016134:Organizational Policy; D010146:Pain; D012015:Reference Standards; D012106:Research; D006113:United Kingdom
Biomedical and Behavioral Research; Council for Science and Society; Genetics and Reproduction