Non-glycosylated protein, containing 87 amino acids, with a molecular weight of 10.3 kDa. Purity is typically 97% as determined by HPLC, reducing and non-reducing SDS-PAGE, UV spectroscopy at 280 nm. B cell-attracting chemokine 1 (BCA-1), also known as CXCL13, is expressed at high levels in lymphoid tissues, such as the spleen, lymph nodes, and Peyer's patches. BCA-1 activates signaling through the receptor Burkitt lymphoma receptor 1 (BLR1) to chemoattract B cells.