This gene encodes a member of the membrane-spanning 4A gene family. Members of this nascent protein family are characterized by common structural features and similar intron/exon splice boundaries and display unique expression patterns among hematopoietic cells and nonlymphoid tissues. This gene encodes a B-lymphocyte surface molecule which plays a role in the development and differentiation of B-cells into plasma cells. This family member is localized to 11q12, among a cluster of family members. Alternative splicing of this gene results in two transcript variants which encode the same protein. [provided by RefSeq, Jul 2008],B1, Bp35, CD20, CVID5, LEU-16, MS4A2, S7,Cancer,CDs,Hematopoietic Progenitors,Immunology & Inflammation,Stem Cells,Tumor immunology,Tumor immunology_Tumor-associated antigens,MS4A1