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Immunostaining for fiber type in fetal semitendinosus muscles. Representative micrographs are depicted for control and intrauterine growth restriction (IUGR) semitendinosus cross sections (8 μm). Sections were stained for myosin heavy chain (MyHC) isoforms (green) and counterstained for desmin (red). A: Type I fibers (MyHC-I); B: Types I or IIa fibers (MyHC-I/IIa); C: Type II fibers (MyHC-II); D: Type IIx fibers (MyHC-IIx). White magnification bar = 50 μm.
