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Longitudinal sections of pectoralis major muscles in affected birds, hematoxylin and eosin staining. a: Long multinuclear chains (arrow) and splitting fibers (arrowhead) are observed in an affected bird (Case No. 1). b: Vacuolar degeneration (arrow) is observed in an affected bird (Case No. 3). Enlarged figures of long multinuclear chains and vacuolar degeneration are inserted in the lower left corner of each figure. Bars=30 µm
