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. 1998 May 18;141(4):943–953. doi: 10.1083/jcb.141.4.943

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The masseter muscle is uniformly composed of MyHC-IIa in IId null mice. Cross sections of masseter muscle from wild-type (a and c) or MyHC-IId null (b and d) mice (8-wk-old males) were immunohistochemically stained with anti–MyHC-IIa (a and b) or anti–MyHC-IIb (c and d) antibodies. Positive fibers were visualized by fluorescence microscopy. Exposure times were (a) 28 s; (b) 30 s; (c) 35 s; (d) 30 s. Masseter sections from wild-type (e) and MyHC-IId null (f) mice were ATPase stained at pH 10.3 (e and f). Bars: (a and b) 40 μm; (c–f) 30 μm.