Predicted to enable DNA-binding transcription factor activity, RNA polymerase II-specific and RNA polymerase II cis-regulatory region sequence-specific DNA binding activity. Acts upstream of or within heart development. Predicted to be part of transcription regulator complex. Predicted to be active in nucleus. Is expressed in several structures, including central nervous system; embryo ectoderm; heart; sensory organ; and skin. Orthologous to human IRX4 (iroquois homeobox 4). [provided by Alliance of Genome Resources, Apr 2022]