TY - GEN AU - Lewis,S E AU - McClure,N TI - Difficulties in distinguishing between a mature spermatid and a testicular spermatozoon SN - 0268-1161 PY - 1999///0119 KW - Cell Differentiation KW - Cell Size KW - Female KW - Fertilization in Vitro KW - methods KW - Humans KW - Male KW - Microinjections KW - Spermatids KW - cytology KW - Spermatozoa KW - Testis N1 - Publication Type: Comment; Comparative Study; Letter UR - https://doi.org/10.1093/humrep/13.10.2979 ER -