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Caspase-3 activity in IPEC-J2 cells. A coincubation assay was performed for 4 h with equal numbers of CP9 and ETEC in IPEC-J2 cells. Cell lysates were collected, and the caspase-3 activity was determined by using caspase-3 colorimetric data. The data are presented as means ± the SEM. Means marked with different letters (a, b, and c) differ significantly (P < 0.05).
