Representative immunohistochemical stainings of the differentially expressed proteins Gal-1, PSME-1, and PRDX-1. (A) Gal-1 staining of a multinuclear HRS cell (thick arrow). (B) PSME-1 staining of HRS cells (thick arrow) and tumor-infiltrating cells. (C) PRDX1 staining showing a positive HRS cell (thick arrow) among PRDX-1–positive macrophages (thin arrow). All magnifications are 400×.