Comparison of GP Ibα surface levels in L2H and L2H/V cells. The cells were labeled with FITC-conjugated anti-GP Ibα monoclonal antibody AN51. (A) Representative flow cytometry histograms of GP Ibα surface levels. (B) Mean fluorescence intensity from 3 experiments. Differences in antibody binding to the 2 cell lines were not statistically significant (paired Student's t test: n = 3, t = 2.275, P = .18).