Fig. 3. Cyclooxygenase activity, in terms of malonaldehyde formation, in the presence of propofol (  black column ) or equivalent volume of Intralipos (  white column ). Zero control (  gradient-color column ) contained neither propofol nor Intralipos (n = 6 each). Data are expressed as mean ± SD. ^a  P < 0.01 significantly different from that with zero control. ^b  P < 0.01 significantly different from that with equivalent volume of Intralipos.