Figure 1. Peripheral blood mononuclear cell arginase activity. Peripheral blood samples from 17 trauma patients were collected daily from admission (day 0) to discharge from the intensive care unit (up to 7 days). Peripheral mononuclear cells were isolated by density gradient separation and arginase activity was measured. Each large box represents the 25th to 75th percentiles. Lines across large boxes show medians; small boxes show means. Whiskers at the top and bottom show upper and lower deciles, respectively. Arginase activity for the 20 controls is also.