title: Ultrastructural differentiation of Leydig cells in the fetal and postnatal hamster testis.
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D006224:Cricetinae / Q000033:anatomy & histology*; D004721:Endoplasmic Reticulum; D005865:Gestational Age; D006654:Histology, Comparative; D007985:Leydig Cells / Q000166:cytology*; D008297:Male; D008854:Microscopy, Electron; D011817:Rabbits; D013737:Testis / Q000196:embryology / Q000254:growth & development*