Mouse hind limb tibialis anterior (TA) muscles were injected with BaCl2 followed by daily systemic administration of rapamycin (Rap) starting 7 days after injury. The animals were sacrificed at different days, and the injured muscles were dissected and cryosectioned followed by hematoxylin (blue) and eosin (pink to red) staining. This image shows the regeneration of muscle tissue seven days after the injury, but before the systematic administration of Rap. The regenerated muscle fibers, stained by eosin and showed as red patches, were formed but not fully matured. Nuclei were stained by hematoxylin in blue. This image corresponds to Fig 10B from JCB 189: 1157-1169, 2010. See also CIL: 13595, 13597, 13598, 13599, and 13600.
TA muscles were isolated by dissection, frozen in liquid nitrogen–cooled 2-methylbutane, and embedded in TBS tissue freezing medium. Sections of 10-μm thickness were made with a cryostat at -20°C, placed on uncoated slides, and stained with hematoxylin and eosin. The stained slides were examined with a microscope (DMI 4000B), and the images were captured with a Fluotar 20× 0.4 NA dry objective (Leica) using a camera (RETIGA Exi). The images were processed as 24-bit colored images using Photoshop.
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