Leukemia Inhibitory Factor is a human gene encoded by the symbol, LIF. It may also be known as: LIF; Differentiation-stimulating factor; D factor; Melanoma-derived LPL inhibitor; MLPLI; Emfilermin; differentiation inhibitory activity; differentiation-inducing factor; hepatocyte-stimulating factor III; cholinergic differentiation factor; human interleukin in DA cells; HILDA. The encoded protein has an amino acid length of 202 and a mass of 22.0 kDa. Other isoforms may exist. Leukemia Inhibitory Factor is a member of the LIF/OSM family. Homologs of this gene exist in other organisms, including: Mouse.