Sox11 IHC analysis. A TMA montage of representative Sox11 IHC signals in each category tested includes rows of benign tonsillar germinal centers (GCs), follicular lymphoma (FL, with tumor grade at the bottom right), chronic lymphatic leukemia/small lymphocytic lymphoma (CLL), and mantle cell lymphoma (including blastoid variant in the third image from the left). Each section in the first 3 rows displays granular cytoplasmic staining. A single positive nucleus in the second FL section is probably endothelial. In contrast, most MCL nuclei express Sox11 with varying intensity. Hematoxylin counterstain; magnification, 185×.