Detection of virus-like particles in germinal centers of normal guinea pigs.
D000818:Animals; D006168:Guinea Pigs; D007421:Intestine, Small; D008198:Lymph Nodes / Q000166:cytology*; D008221:Lymphoid Tissue / Q000166:cytology*; D008643:Mesentery; D008854:Microscopy, Electron; D013154:Spleen / Q000166:cytology*