The cellular basis of the maintenance of passive enhancement.
D000818:Animals; D005455:Fluorescent Antibody Technique; D006082:Graft Enhancement, Immunologic; D006084:Graft Rejection; D006085:Graft Survival; D016027:Heart Transplantation; D051381:Rats; D011919:Rats, Inbred Strains / Q000276:immunology; D012397:Rosette Formation; D013601:T-Lymphocytes / Q000276:immunology*; D050378:T-Lymphocytes, Regulatory / Q000276:immunology; D013997:Time Factors