Fig. 2From: Effective fraction of Bletilla striata reduces the inflammatory cytokine production induced by water and organic extracts of airborne fine particulate matter (PM2.5) in vitroTNF-α expression after exposure PM2.5 extracts. TNF-α expression in RAW264.7 cells treated for 12 and 24 h with (a) WEP and (b) OEP. * < 0.05, ** < 0.01 vs. controlBack to article page