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Fig. 5. Mass spectrometric analysis of ß1 integrin-associated proteins on the cell surface. Cells were surface labelled with antibody (lane 1, control; lane 2, B3B11; lane 3, 12G10). The protein complexes were isolated and separated in 8% SDS-PAGE gels under reducing conditions and stained with Coomassie Blue. The visible protein bands were cut out for in-gel digestion and mass spectrometric analysis. The identified proteins are labelled and marked with arrows.