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Serial transverse sections of the plantaris muscles in rats of the Wistar (WR; A), Goto-Kakizaki (GK; B), and exercised Goto-Kakizaki (GK-Ex; C) groups stained for ATPase activity after preincubation at pH 4.5. 1, type I; 2, type IIA; 3, type IIB. Scale bar=200 μm.
