An attempt at isolation and partial characterization of specific antibodies from antithymocyte serum.

: Specific anti-T antibody was isolated from rabbit anti-mouse and anti-rat thymocyte antiserum on immunosorbent prepared by fixation of brain homogenate in glutaraldehyde. Conditions of isolation, purity of obtained antibody and cytotoxic activity were followed. The resulting preparation containing immunoglobulin G is contaminated with beta globulin and albumin, contains non-precipitating proteins originating from brain tissue and is cytotoxic for thymocytes. Cytotoxicity for bone marrow cells was not demonstrated.