Enables several functions, including DNA-binding transcription repressor activity, RNA polymerase II-specific; HMG box domain binding activity; and RNA polymerase II transcription regulatory region sequence-specific DNA binding activity. Involved in several processes, including negative regulation of angiogenesis; negative regulation of transcription, DNA-templated; and regulation of signal transduction. Acts upstream of or within several processes, including animal organ development; hepatic duct development; and primitive streak formation. Located in cytoplasm and nucleus. Is expressed in several structures, including central nervous system; early conceptus; gut; liver and biliary system; and metanephros. Orthologous to human HHEX (hematopoietically expressed homeobox). [provided by Alliance of Genome Resources, Apr 2022]