Expression of CD38, RAR-α, and RAR-β proteins in lymphomas. Lymphomas that developed spontaneously in RAR-α antisense homozygous mice, bcl-2 transgenic mice, c-myc transgenic mice, or p53 knockout mice were homogenized, and the soluble extracts (100 μg) were resolved on SDS-PAGE, transferred to nitrocellulose membrane, and probed with anti-CD38 antibody (A). After stripping, the membrane was reprobed with RAR-α–specific (B) or RAR-β–specific antibody (C). Protein extract of skin from a normal mouse was loaded in parallel as a reference.