Expression pattern of cell surface antigens (n = 57) by B-CLL cells with (▩) and without (□) 11q deletion and by positive control cell preparations (▪; see Materials and Methods for details). Marked by the box diagram are the 10th, 25th, 50th (median), 75th, and the 90th percentiles. Antigens were combined into groups with high (++), low (+), and no (−) expression.