Involved in the transcriptional regulation of genes required for mesoderm formation and differentiation. Binds to a palindromic site (called T site) and activates gene transcription when bound to such a site. Monomer. Binds DNA as a monomer. A mutation in position 63 is responsible for a short-tail trait in a bob-tailed dog (PubMed:11252170). The homozygous mutation is lethal (PubMed:11252170).