Cover: β-galactosidase staining in hind limb skeletal muscles of a 1-month-old dystrophin Purkinje promoter/muscle enhancerlacZ transgenic mouse. The Purkinje promoter is normally inactive in skeletal muscle but gets activated by inclusion of
the dystrophin muscle enhancer. Note the mosaic nature of transgene expression in longitudinal section where some fibers are clearly positive for β-galactosidase staining while others remain unstained. See Article by De Repentigny et al., in this issue, pp. 2853-2862.
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