Bpifb4 encodes the human gene, BPI fold containing family B member 4. It may also be known as: BPI fold-containing family B member 4; Ligand-binding protein RY2G5; Long palate, lung and nasal epithelium carcinoma-associated protein 4; BPI fold containing family B, member 4; C20orf186; LPLUNC4; RY2G5; dJ726C3.5. The encoded protein has an amino acid length of 614 and a mass of 65.1 kDa. Other isoforms may exist. Homologs of this gene exist in other organisms, including: Mouse.