LD78β is a CC chemokine that is closely related to MIP-1α. It signals through the CCR5 receptor and the β-chemokine receptor, D6. LD78β has been shown to exhibit potent activity in HIV suppression assays. Recombinant human LD78β is a 7.7 kDa protein containing 70 amino acid residues, including the four conserved cysteine residues present in CC chemokines.