Normal B- and T-cell development in B7-H2^–/– mice. Flow cytometry analyses of B- and/or T-cell populations in the (A) thymus, (B) bone marrow, (C) spleen, and (D) peritoneal cavity of wild-type, heterozygous, and homozygous B7-H2 knockout mice. Numbers indicate the percent of lymphocytes. Data shown are representative of 5 independent experiments.