Number and distribution of the primary germ cells in early postsomite stage duck embryos.
D000818:Animals; D002454:Cell Differentiation; D004372:Ducks; D004625:Embryo, Nonmammalian; D005260:Female; D005854:Germ Cells / Q000166:cytology*; D008297:Male; D010053:Ovary / Q000196:embryology; D010063:Ovum / Q000166:cytology; D013094:Spermatozoa / Q000166:cytology; D013737:Testis / Q000196:embryology; D013997:Time Factors