title: Biology of spermatogenesis--the challenges ahead.
authors.affiliation: New York, NY, United States. Electronic address: y-cheng@popcbr.rockefeller.edu.
authors.forename: C Yan
authors.initials: CY
authors.lastname: Cheng
mesh_terms: D000818:Animals; D035843:Biomedical Research / Q000191:economics; D005380:Financing, Government; D006801:Humans; D008297:Male; D009316:National Institutes of Health (U.S.) / Q000191:economics; D013091:Spermatogenesis; D014481:United States