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Intracellular cAMP concentrations in lysates of IPEC-J2 cells measured by ELISA at 4 h after commencement of incubation with bacterial strains (Ecf, ETEC, and Ecf + ETEC) compared with control [means ± SEM]. Groups differ significantly (P ≤ 0.05) when marked with different letters, (e.g. a, b) in the figure. N = 5 independent experiments.
