Effects of various LPSs on 5HT levels in blood and lung.

Each column shows the 5HT level at 5 minutes after intravenous injection of a given LPS (or saline). One of the LPSs (1 mg/kg) was injected into a given mouse, and 5 minutes later, blood and lungs were removed and assayed for 5HT. Each value is the mean ± SD from 4 mice. *P < .05, **P < .01 versus saline group.