May be a transcription regulator involved in cell-cycle progression and skeletal muscle differentiation. May repress GTF2I transcriptional functions, by preventing its nuclear residency, or by inhibiting its transcriptional activation. May contribute to slow-twitch fiber type specificity during myogenesis and in regenerating muscles. Binds troponin I slow-muscle fiber enhancer (USE B1). Binds specifically and with high affinity to the EFG sequences derived from the early enhancer of HOXC8 By similarity.Yan X., Biochem. J. 345:749-757(2000).Hillier L.W., Nature 424:157-164(2003).Tussie-Luna M.I., Proc. Natl. Acad. Sci. U.S.A. 98:7789-7794(2001).