title: Virus particles in primordial germ cells of fetal guinea pigs.
mesh_terms: D000818:Animals; D004721:Endoplasmic Reticulum / Q000382:microbiology; D005260:Female; D005333:Fetus / Q000382:microbiology*; D005854:Germ Cells / Q000382:microbiology*; D005865:Gestational Age; D008297:Male; D008854:Microscopy, Electron; D010063:Ovum / Q000382:microbiology; D012190:Retroviridae / Q000302:isolation & purification; D013094:Spermatozoa / Q000382:microbiology; D014780:Viruses / Q000302:isolation & purification*