CD49d bimodal and homogeneous expression. (A-B) Histogram plots of CD49d expression (red) in 2 representative CLL cases with CD49d bimodal expression (A) and in 2 representative CLL cases with CD49d homogeneous expression (B). Blue histograms refer to unstained cells. The dark red color corresponds to the overlap of CD49d and unstained histogram plots. (C-D) Relative percentage of frequency of CD49d expression in CLL with CD49d bimodal (C) and CD49d homogeneous (D) expression.