Widely expressed. Expressed at higher level in spleen, ovary, small intestine, colon, peripheral blood leukocytes and liver. Also expressed in testis, ovary, aorta, appendix, trachea, pituitary gland, bladder, uterus, spinal cord, salivary gland, stomach, mammary gland and bone marrow. Weakly or not expressed in fetal spleen, adult thymus and certain cancer cell lines. Belongs to the BIVM family.