Graft rejection, the histocompatibility complex and the Langerhans' cell.
D006084:Graft Rejection; D006649:Histocompatibility Antigens / Q000276:immunology; D006801:Humans; D007108:Immune Tolerance; D007801:Langerhans Cells / Q000276:immunology*; D008264:Macrophages / Q000276:immunology; D008285:Major Histocompatibility Complex; D013601:T-Lymphocytes / Q000276:immunology
D006649:Histocompatibility Antigens