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. Interacts with the retinoblastoma protein (RB1) via its C-terminus. Widely expressed. Expressed in somites, neural tube and brain at 8-8.5 dpc. Expression remains constant from 9.5-12.5 dpc with highest expression levels in the limb buds, branchial arches, crainofacial area, brain and spinal cord. Belongs to the TFII-I family.