CD33L3, or Sialic acid binding Ig-like lectin 15, is a human gene encoded by SIGLEC15. It may also be known as: Sialic acid-binding Ig-like lectin 15; CD33 antigen-like 3; Siglec-15; HsT1361. The encoded protein has an amino acid length of 328 and a mass of 35.7 kDa. Other isoforms may exist. CD33L3 is a member of the Immunoglobulin superfamily, SIGLEC (sialic acid binding Ig-like lectin) family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Frog, Chicken.