title: New sources of sex cells.
mesh_terms: D033041:Embryo Research / Q000941:ethics* / Q000331:legislation & jurisprudence; D005260:Female; D006801:Humans; D008297:Male; D010063:Ovum / Q000166:cytology*; D039904:Pluripotent Stem Cells / Q000166:cytology*; D011247:Pregnancy; D012867:Skin / Q000166:cytology; D013094:Spermatozoa / Q000166:cytology*