Immunology: morphology and function.
D000818:Animals; D002454:Cell Differentiation; D002471:Cell Transformation, Neoplastic; D004847:Epithelial Cells; D004848:Epithelium / Q000276:immunology / Q000473:pathology; D006801:Humans; D008198:Lymph Nodes / Q000166:cytology*; D008214:Lymphocytes / Q000166:cytology; D013194:Staining and Labeling; D013601:T-Lymphocytes / Q000166:cytology