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Relative mRNA expressions of myosin heavy-chain (MyHC) isoform genes in the muscles of the Cherry Valley duck (A), Small-sized Beijing duck (B) and Liancheng White duck (C). mRNA expression was normalized to β-actin gene expression. Data are expressed as means ± SD (n = 3). Statistically significant differences are indicated by different letters (P < 0.05). Abbreviations: PEDL, m. extensor digitorum longus; M, m. pectoralis major; GAS, m. gastrocnemius; SOL, m. soleus.
