Sheep lymphocyte antigens (OLA). I. Major histocompatibility complex class I molecules

Three monoclonal antibodies, SBU.I41-17, 41-19 and 41-28, have been produced which recognize sheep class I major histocompatibility complex antigens (OLA). All three antibodies are able to precipitate a heavy chain of 44,000 MW and a smaller β₂-microglobulin of 12,000 MW from ¹²⁵I-surface labelled lymphocytes. The antibodies have been used to localize sheep OLA Class I antigens in lymphoid and non-lymphoid tissues using indirect immunoperoxidase histological staining and cytofluorograph analyses. Evidence suggests that the three antibodies are directed against monomorphic determinants but that they recognize different epitopes.