title: [Ultrastructural study of the primordial germ cells and their differentiation in Mugil cephalus L. 1758 (Teleostei, Mugilidae)].
abstract: Primordial germ cells (PGC) in Mugil cephalus are characterized by a heavy electron density (nuclear and cytoplasmic) and by very irregular outlines. Sequential cytological events during differentiation, from PGC to gonia, were studied. The decrease of electron density which is observed first, with an increase in size of both the cell itself and of its nucleus, is followed by an increase in number of cytoplasmic organelles and by an evolution of nucleolar structure. Finally, the regularisation of cellular outlines leads to the gonial stage.
mesh_terms: D000818:Animals; D005260:Female; D005399:Fishes / Q000196:embryology*; D005854:Germ Cells / Q000648:ultrastructure*; D006066:Gonads / Q000196:embryology; D008297:Male; D008854:Microscopy, Electron; D012733:Sex Differentiation; D013093:Spermatogonia / Q000648:ultrastructure
vernacular_title: Etude ultrastructurale des cellules gérminales primordiales et de leur différenciation chez Mugil cephalus L. 1758 (Téléostéen, Mugilidé).