Essential protein. Putative transcription factor. Homo or heterodimer. Interacts with ZHD1, ZHD3, ZHD4, ZHD5, ZHD6, ZHD7, ZHD8, ZHD9, ZHD10 and ZHD11. Mostly expressed in flowers and, to a lower extent, in inflorescence, stems and leaves. The homeodomain differs form the typical one by having namely 4 instead of 3 extra amino acids inserted in the loop between helix 1 and helix 2. Arrested at early embryo stages.