BPI is a symbol for the gene, Bactericidal/permeability-increasing protein, in humans. Other names include: Bactericidal permeability-increasing protein; CAP 57; BPI fold containing family D, member 1; BPIFD1; rBPI. The encoded protein has an amino acid length of 487 and a mass of 53.9 kDa. Other isoforms may exist. BPI is a member of the BPI/LBP/Plunc superfamily, BPI/LBP family. This gene shares homology with other species, including: Mouse, Rat, Frog, Chicken.