Freezing embryos.
D033421:Beginning of Human Life; D004624:Embryo Transfer; D004622:Embryo, Mammalian; D004992:Ethics, Medical; D005260:Female; D005615:Freezing; D006801:Humans; D019369:Life; D028723:Personhood; D011247:Pregnancy; D018570:Risk Assessment; D014021:Tissue Preservation