Genetic engineering: reprise.
D004992:Ethics, Medical; D005306:Fertilization; D005615:Freezing; D005826:Genetics, Medical; D006805:Human Experimentation; D006801:Humans; D066298:In Vitro Techniques; D007315:Insemination, Artificial; D012098:Reproduction; D012661:Semen; D014015:Tissue Banks; D014021:Tissue Preservation