Effect of alpha-melanocyte-stimulating hormone (α-MSH) and (CKPV)2 on neutrophil chemotaxis induced by supernatants from monosodium urate-stimulated monocytes. Neutrophils were pretreated with or without the peptides (10-6 M) for 18 hours before functional assays. Results are shown as number of cells per high-power field (hpf). Means ± standard errors of the mean of five separate experiments are presented. *P < 0.01 versus RPMI.