Neurotactin, or Chemokine (C-X3-C motif) ligand 1, is a human gene encoded by CX3CL1. It may also be known as: Fractalkine; C-X3-C motif chemokine 1; CX3C membrane-anchored chemokine; Small-inducible cytokine D1; ABCD-3; C3Xkine; CXC3; CXC3C; SCYD1. The encoded protein has an amino acid length of 397 and a mass of 42.2 kDa. Neurotactin is a member of the Intercrine delta family. Homologs of this gene exist in other organisms, including: Fly.