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Expression of BCO2 in chicken back skin at four different times. Relative expression analyses in back skin of BCO2 gene were normalized to the geometric average of ACTB (β-actin) and GAPDH genes. Error bars represent the SE; * and ** indicate significant differences at p ≤ 0.05 and p ≤ 0.01, respectively, in gene expression between the Qingjiao Ma (Q) and Guangxi Huang (S4) chicken breeds.
