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June 29, 2017; 129 (26)

Cover image expansion

In the lymph node tissue of CLL patients with Richter transformation, PD-L1 (red) stains histiocytes while most of the Pax5-positive tumor B cells (green) appear PD-L1 negative. These two markers are mostly nonoverlapping. See the article by Ding et al on page 3419.