Formyl peptide receptor 1, a Chemoattractant Receptor, mediates chemotaxis, degranulation, and superoxide production, as part of the inflammatory response. Bacterial N-formylmethionyl peptides and Annexin A1, specific ligands for FPR1, attract polymorphonuclear neutrophils to sites of infection. FPR receptors promote the phosphorylation and downregulation of CCR5, which has been shown to inhibit HIV infection. Therefore, ligands for an FPR receptor may be able to inhibit HIV infection. (WO0157074) FPR1 has been reported in blood monocytes, neutrophils, and phagocytes, as well as in liver, astrocytes, and microglia. ESTs have been isolated from B-cell/lung/testis, blood, brain, eye, heart, liver/spleen, kidney, lung, pancreas, placenta, spleen, and uterus libraries.