The percentage of circulating monocytes producing IL-1β, TNFα or IL-12 before, and at 3, 6 and 24 h after the injection of LPS (4 ng/kg body weight) of the two control individuals not treated with RWJ-67657. Each line represents an individual, open symbols for one individual, closed symbols for the other individual. (□,▪) IL-1β; (○,•) TNFα; (▵,▴) IL-12.