Expression of human CD38 and HLA-DR in lymphoid cells from the ascites fluid of SCID/beige mice inoculated IP with BCBL-1 cells. (Left panels) FACS analysis of CD-38 and HLA-DR expression by BCBL-1 cells cultured in vitro. (Middle panels) Immunohistochemical staining for human CD-38 and HLA-DR of cytospin preparations from ascites of mice injected IP with BCBL-1 cells. (Right panels) Control staining with mouse IgG and rat IgG of cytospin preparations from ascites of mice injected IP with BCBL-1 cells.