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Adenosine receptor (A1, A2A, A2B, and A3) mRNA expression in HCT-8 cells treated with C. difficile toxin A (TcdA) or B (TcdB). Assays were performed 2 and 4 h postintoxication with either TcdA or TcdB at concentrations from 0.1 to 100 μg/ml. Each treatment had 3 replicates per time point.
