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To analyze IL-1 secretion, 5 mM ATP (Sigma, MO, USA) was added to the culture media for the last 6 h before harvest
The chi-square test allows for comparisons among multiple groups, in this case between selections when two packs were presented as well as selections when three packs were presented, by testing the hypothesis that the observed frequencies do not differ from their expected values, which was specified to be equally distributed among choices
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