Immunostaining of PAG and SIT in neoplastic lymphoid cells. PAG is present in cases of both B- and T-cell neoplasia. Note the 2 cases of DLBCL, one positive and one negative. Two DLBCL-derived cell lines of GC type express PAG, whereas the other 2 (of “activated” subtype) are negative. SIT expression is shown in a variety of B-cell neoplasms, including a case of myeloma. Image acquisition was performed as described for Figure 1.