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Representative semi-quantitative RT-PCR for myosin heavy chain (MyHC) IIB and IIB+IIX mRNAs in (a) Longissimus dorsi (LD), (b) Supraspinatus (SS) and (c) Semitendinosus (ST) muscles from D60 and D120 lambs. The 6-day administration of β agonist (BA) induced the expression of MyHCIIB mRNA in the LD, with no expression of this transcript in either the control (CO) or Growth Hormone (GH) treated lambs. BA also increased MyHCIIB expression in the SS and ST muscles.
