KIR3DX1 is a symbol for the gene, Killer cell immunoglobulin-like receptor, three domains, X1, in humans. Other names include: Putative killer cell immunoglobulin-like receptor-like protein KIR3DX1; Leukocyte receptor cluster member 12; KIR3DL0; LENG12. The encoded protein has an amino acid length of 352 and a mass of 38.8 kDa. Other isoforms may exist.