The present data confirm that the tibialis anterior is a fast-contracting muscle that, with age progression, exhibits significantly more type-IIB fibers to the detriment of type-IIX fibers that display a negative trend, whereas type-IIA fibers seem not to undergo major quantitative changes.
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Age Dependent Modification of the Metabolic Profile of the Tibialis Anterior Muscle Fibers in C57BL/6J Mice.
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