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Non-HLA antibodies after rejection of HLA identical kidney transplants.

1. Non-HLA antibodies reactive against CLL and lymphoblast lines were detected by cytotoxicity in sera from 22 patients who had been transplanted with kidneys from HLA identical donors. 2. Whether these antibodies had been responsible for the rejection of the HLA identical grafts remain to be determined. 3. Among 71 patients who received HLA mismatched transplants, and had rejected their grafts, 65 (93%), formed antibodies to HLA or MICA antigens. The 5 patients who did not develop antibodies were shown to have antibodies against CLL and lymphoblast lines, suggesting that these grafts may have been rejected by non-HLA antibodies.