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Section of pectoral muscle tissue. (A) The breast muscle fiber morphology of pigeons (n = 10) with hematoxylin-eosin (H&E) staining at 0, 1, 2, 3, and 4 weeks after hatching (40×). Scale bar: 50 μm. (B) Oil red O staining of frozen sections of pigeon breast muscle of 4 weeks (n = 50). Scale bar: 50 μm.
