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Platelet-activating factor (PAF)-acetylhydrolase (PAF-AH) activity (top) and caspase 3/7 activity (bottom) measured in human lung microvascular endothelial cells (HMVEC-L) incubated with increasing concentrations of cigarette smoke extract (CSE) for 8 h. Data are means ± SE for 4 separate cell cultures. *P < 0.05; **P < 0.01 compared with control.
