May form heterodimeric complex with the TALE/BELL proteins (By similarity). Interacts with OFP1, OFP2, OFP4, OFP12 and OFP14 (PubMed:15781858). Interacts with KNATM-B (PubMed:18398054). A number of isoforms are produced. According to EST sequences. Belongs to the TALE/KNOX homeobox family. Truncated N-terminus.