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Protein abundances for claudin-1 (a), claudin-3 (b), claudin-4 (c), and occludin (d) in IPEC-1 cells. IPEC-1 cells were cultured in the absence or presence of 12.5 or 25 μmol/L CA for 24 h. Cells were collected and protein abundances were analyzed. Values are expressed as means ± SEM, n = 3. Means without a common letter differ, P < 0.05. CA, Cinnamicaldehyde; IPEC-1, intestinal porcine epithelial cell line 1
