binding protein ZPR3 is a small-leucine zipper containing protein that is involved in the establishment of leaf polarity. LITTLE ZIPPER 3 (ZPR3)%3B Has 90 Blast hits to 90 proteins in 11 species: Archae - 0%3B Bacteria - 0%3B Metazoa - 0%3B Fungi - 0%3B Plants - 90%3B Viruses - 0%3B Other Eukaryotes - 0 (source: NCBI BLink).