MS4A1 and lymphoma: These results indicate the presence of genes for CD20 (MS4A1), CD22, and CD44 (signaling component of the macrophage migration inhibitor factor (MIF)-CD74-CD44 receptor complex), thus corroborating the previous PCR results for the presence of CD20 and, also, CD74 genes in the GW-532 and GW-584 lymphoma hybrid tumors [36], [37].