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Measurement of caspase 8 (A), caspase 9 (B), and caspase 3/7 (C) activity at 4 h, 6 h, and 8 h postinfection of epithelial cells with nonstressed and cold-stressed (5°C, 48 h) S. Typhimurium. Asterisks indicate significant differences (P < 0.05) between infection with cold-stressed S. Typhimurium and infection with nonstressed S. Typhimurium.
