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Muscle structure of control (Con) and E. faecium AL41 (EF) supplemented chicks. Representative pectoralis muscle histological sections of chicks at 1, 5, 8, and 12 d of age, stained with hematoxylin/eosin (HE, upper panel) or eosin/alkaline phosphatase (EAP, lower panel) as used for image analysis. Scale bars represent 50 µm.
