NAALADL2 is a 795 amino acid single-pass type II membrane protein that belongs to the peptidase M28 family and M28B subfamily. Existing as two alternatively spliced isoforms, NAALADL2 is expressed at highest levels in placenta and kidney, and has also been observed in certain embryonic tissues. NAALADL2 may be catalytically inactive. The gene encoding NAALADL2 maps to human chromosome 3, which houses over 1,100 genes, including a chemokine receptor (CKR) gene cluster and a variety of human cancer-related gene loci. Key tumor suppressing genes on chromosome 3 include those that encode the apoptosis mediator RASSF1, the cell migration regulator HYAL1 and the angiogenesis suppressor SEMA3B. Marfan Syndrome, porphyria, von Hippel-Lindau syndrome, osteogenesis imperfecta and Charcot-Marie-Tooth Disease are a few of the numerous genetic diseases associated with chromosome 3.