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Effects of TNF-α- and TRAIL-neutralizing Abs on the viability of Calu-3 cells following ricin and TRAIL treatment. Calu-3 cells were treated with ricin or ricin plus TRAIL in the presence of neutralizing anti-TNF-α Ab or anti-TRAIL Ab or the combination of the two Abs. Cell viability was measured 72 h later. The results (means ± SD) represent a single experiment done in triplicate and repeated at least three times. **, P < 0.01; *** P < 0.001 (versus untreated cells [negative control]).
