title: The principal cells in the thymus expressing MHC antigens are epithelial.
mesh_terms: D000818:Animals; D002450:Cell Communication; D002454:Cell Differentiation; D004847:Epithelial Cells; D004848:Epithelium / Q000276:immunology; D006183:H-2 Antigens / Q000235:genetics; D006680:HLA Antigens / Q000235:genetics; D006649:Histocompatibility Antigens / Q000145:classification / Q000235:genetics*; D006801:Humans; D051379:Mice; D011828:Radiation Chimera; D013950:Thymus Gland / Q000166:cytology* / Q000276:immunology
chemical_list: D006183:H-2 Antigens; D006680:HLA Antigens; D006649:Histocompatibility Antigens