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Quantitative RT-PCR for expression of cytochrome c (CYCS), caspase 9 (CASP9), caspase 3 (CASP3), and caspase 7 (CASP7) in the broiler pectoralis major muscle for the quality classes. Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) was used to control for normalization. Bars indicate the standard error of the mean. a-bDifferent letters denote significant differences (P < 0.05). Abbreviations: RFN, reddish, firm, and non-exudative; PSE, pale, soft, and exudative.
