Evan's blue-stained intradermal injection sites showing the kinetics of the dermal response to exogenous human RANTES 10 ng/50 μL (c) and MCP-1 10 ng/50 μL (d); while (a) is a negative control (PBS 50 μL) and (b) is a positive control (FMLP 10⁻⁶ mol/L in 50 μL). This representative experiment was found to be reproducible and has been performed at least three times.