Transcriptional activator that binds to the consensus sequence 5'-AGATAG-3'. Associated with cardiac specification and can regulate cardiac-specific transcription during embryogenesis. Activates the expression of cardiac MHC-alpha in vivo. Expressed at high levels in heart, small intestine, stomach, ovary, and liver. Found at much lower levels in lung, spleen, pancreas and skin. Expressed in cardiac progenitors during embryogenesis and up-regulated during gastrulation.