Sequence-specific transcription factor which is part of a developmental regulatory system that provides cells with specific positional identities on the anterior-posterior axis. Acts on the anterior body structures. Acts downstream of meis3 to pattern the hindbrain. Expression is abundant in the gastrula dorsal lip. First detected at stage 10.5 and peaks at mid-gastrula (stage 11.5). Belongs to the Antp homeobox family. Labial subfamily. Sequence of unknown origin at C-terminus.