The mastocytes in the lymphatic organs of the rat.
D000818:Animals; D006632:Histamine / Q000032:analysis; D006651:Histocytochemistry; D008198:Lymph Nodes / Q000166:cytology*; D008297:Male; D008407:Mast Cells / Q000166:cytology*; D008854:Microscopy, Electron; D051381:Rats; D012701:Serotonin / Q000032:analysis
D012701:Serotonin; D006632:Histamine