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CD22 site density. (A) Surface CD22 site density measured using ABC at baseline and after cycle 1 in 13 patients with residual leukemia after cycle 1. (B) Surface CD22 expression (CD22%) at baseline and after cycle 1 in 13 patients with residual leukemia after cycle 1, demonstrating decrease from baseline in eight of 13 patients. ABC, antibody bound per cell.
