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AS is expressed in contact with human plasma. Cells were grown in human plasma for 4 h, washed, and then labeled with a monoclonal antibody against AS. (A) OG1RF cells after growth in plasma. (B) OG1RF(pCF10). Only pCF10-containing cells showed labeling for AS in human plasma, indicating plasma induction of AS. AS was not expressed in cells that were not induced with cCF10 (data not shown).
