The role of a "germinal plasm" in the formation of primordial germ cells in Rana pipiens.
D000818:Animals; D001001:Anura; D003593:Cytoplasm; D005260:Female; D005854:Germ Cells; D066298:In Vitro Techniques; D010063:Ovum / Q000166:cytology* / Q000528:radiation effects*; D011830:Radiation Effects; D014466:Ultraviolet Rays