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Fig. 1. Analysis of MHC-A and MHC-B expression in TSU-pr1. Immunoblots of TSU-pr1 cell extracts immunoprecipitated with antibodies against either MHC-A or MHC-B, or both, were electrophoresed as described (Kelley et al., 1996). Extracts of RBL and COS cells electrophoresed in 7% SDS-PAGE. The proteins were transferred to nitrocellulose membranes and were probed with an antibody specific to either MHC-A or MHC-B, or with both.