Further examples of tryptase (red) and PD-L1 (light green) coexpression on MCs in spleen from a MCL patient. Cell nuclei are blue (DAPI). Images acquired at 60× magnification. Scale bar, 20 μm. Coexpression is indicated by yellow arrows. A subset of MCs lacking PD-L1 expression is noted. Small numbers of PD-L1⁺ cells lacking tryptase expression are also present.