This family of proteins has are plant transcription factors, and have been named ZF-HD for zinc finger homeodomain proteins, on the basis of similarity to proteins of known structure [1]. This region is thought to be involved in the formation of homo and heterodimers, and may form a zinc finger [1].

1: Characterization of a novel class of plant homeodomain proteins that bind to the C4 phosphoenolpyruvate carboxylase gene of Flaveria trinervia. Windhovel A, Hein I, Dabrowa R, Stockhaus J; Plant Mol Biol 2001;45:201-214. PMID:11289511