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Figure 1: Histological sections of pirarucu (A. gigas) lateral skeletal muscle from groupA (A and B) and group C (C and D). In A and C red muscle and in B and D, whitemuscle. Polygonal or round muscle fibers (F) surrounded by a thin connectivetissue, the endomysium (*). Note the perimysium (arrowhead) grouping musclefibers into fascicles. Nuclei (arrow) are in the peripheral location. HE stain (40X).
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