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. 2009 Jan;40(1):19–30. doi: 10.1165/rcmb.2008-0105OC

Figure 1.

Figure 1.

Inflammatory cytokine production by Baltimore particulate matter (PM) in submerged and air–liquid interface grown human bronchial epithelial cells (HBEpCs). HBEpCs grown (A) submerged or (B) at air-liquid interface were challenged with Baltimore PM (100 μg/ml) for 24 hours. Media were collected and centrifuged at 2,000 × g at 4°C, and cytokine levels were quantified by enzyme-linked immunosorbent assay (ELISA). Values are mean ± SD of three independent determinations in triplicate and expressed as picograms of cytokine released per milligram of protein in cell lysates. *Significantly different from cells exposed to vehicle alone (P < 0.05).