Graft vs Host Disease/immunology; Graft vs Host Disease/prevention & control; T-Lymphocyte Subsets/immunology; T-Lymphocytes, Regulatory/immunology; Animals; CD3 Complex/biosynthesis; CD4-Positive T-Lymphocytes/immunology; CD4-Positive T-Lymphocytes/metabolism; CD8-Positive T-Lymphocytes/immunology; CD8-Positive T-Lymphocytes/metabolism; CD8-Positive T-Lymphocytes/transplantation; Cell Division/genetics; Cell Division/immunology; Clone Cells; Coculture Techniques; Cytotoxicity, Immunologic/genetics; Graft vs Host Disease/genetics; Graft vs Host Disease/pathology; H-2 Antigens/administration & dosage; H-2 Antigens/genetics; H-2 Antigens/immunology; Histocompatibility Antigen H-2D; Histocompatibility Testing; Lymphocyte Transfusion; Mice; Mice, Inbred BALB C; Mice, Inbred C3H; Mice, Inbred C57BL; Mice, SCID; Mice, Transgenic; Skin Transplantation/adverse effects; Skin Transplantation/immunology; Spleen/cytology; Spleen/immunology; Spleen/transplantation; T-Lymphocyte Subsets/metabolism; T-Lymphocyte Subsets/transplantation; T-Lymphocytes, Regulatory/metabolism; T-Lymphocytes, Regulatory/transplantation; Transplantation Tolerance/genetics; Transplantation, Isogeneic/immunology; Transplantation, Isogeneic/pathology