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Antibiotic exposure alters myofiber characteristics and types composition in longissimus muscle of piglets. a. Histological images of muscle obtained from H&E staining with no apparent difference in myofiber size between groups. b-d. Myofiber diameter, cross-sectional area and density. e-h. Myosin heavy chain isoforms expression in muscle. MYH, myosin heavy chain. *P < 0.05, ** P < 0.01. n = 9 for each group
