Lymphocytotoxic alloantibodies have been recognized in primiparous mare sera and colostra using the two-step microcytotoxicity test. The antigens detected on the leukocyte membrane do not occur on the erythrocytes. After testing on a cell panel from unrelated horses, absorptions with leukocytes were carried out. The subsequent retesting of the serum reagents on a cell panel including cells from 24 families rendered possible a grouping of preliminary monospecific reagents characterizing 18 antigen specificities on the cell membrane.
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Lazáry et al. (1980) studied this question.