Anti-CX3CR1 antibodies are directed against the protein encoded by the gene 'C-X3-C motif chemokine receptor 1' in humans and may also be known as C-X-X-X-C Chemokine Receptor 1, CCRL1, CMKBRL1, CMKDR1, GPR13, and CX3C chemokine receptor 1. Structurally, the protein is reported to be 40.4 kilodaltons in mass. Based on gene name, canine, porcine, monkey, mouse, and rat orthologs may also be found.