Figure 1.

Skeletal muscle gene expression after cardiotoxin injury. (a) RT-PCR/Southern blot assay of the expression of MNF-α, MNF-β, and basic helix–loop–helix proteins of the MyoD family in regenerating muscles after cardiotoxin injury. MNF-α and MNF-β are reciprocally expressed in myogenic cells during regeneration, with MNF-β expressed in the quiescent stem cell and MNF-α expressed during stem cell proliferation. (b) Schematic of MNF-α and MNF-β expression during muscle regeneration.