Widely expressed with highest levels in brain, ovary, mammary gland, skin and adipose tissue. Also expressed in testis. Detected in a number of tumors including osteosarcoma, mammary carcinoma and hepatocellular carcinoma. Encoded by one of the numerous copies of NBPF genes clustered in the p36, p12 and q21 region of the chromosome 1. Belongs to the NBPF family.