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The histology observation of microstructure in keel tissues of ducks under different light supplement modes. Hematoxylin-eosin staining (magnification, 1 ×, 4 ×, 20 ×). Abbreviations: BC, blood cells; BM, bone matrix (trabecular bone); C, chondrocyte; CM, cartilage matrix; HC, hypertrophic chondrocytes; MT, muscle tissue; MC, marrow cavities; OCY, osteocytes; OB, osteoblasts.
