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Fig. 1
Expression pattern of early markers for fast-twitch muscles. Whole-mount in situ hybridization showing expression of myl1, fMyHC1.3, mylz2, mylz3, tnni2, and tnnt3a in embryos at 10-, 12-, and 15-somite stages. Expression of myl1, fMyHC1.3, mylz2, and tnni2 is detected in the paraxial mesoderm at 10-somite stage, mylz3 expression is first detected at 12-somite stage, and tnnt3a starts to be expressed at 15-somite stage. mesp-a (in red) labels somite primordia. Arrowheads indicate the earliest expressing somite.
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