title: Ultrastructure of Peyer's patches in the aged mouse.
mesh_terms: D000367:Age Factors; D000818:Animals; D003593:Cytoplasm; D003594:Cytoplasmic Granules; D005724:Ganglia / Q000166:cytology; D008221:Lymphoid Tissue / Q000166:cytology*; D008247:Lysosomes; D008264:Macrophages; D008297:Male; D008407:Mast Cells; D051379:Mice; D008854:Microscopy, Electron; D010581:Peyer's Patches / Q000166:cytology; D010950:Plasma Cells