Sequence-specific transcription factor which is part of a developmental regulatory system that provides cells with specific positional identities on the anterior-posterior axis. Detected in adult kidney, but not in other adult tissues tested. Detected in 12-, 14-, and 17-day-old mouse embryos in the posterior half of the myelencephalon, spinal cord, dorsal root ganglia, first cervical vertebra, thyroid gland, kidney tubules, esophagus, stomach, and intestines. Belongs to the Antp homeobox family. It is uncertain whether Met-1 or Met-17 is the initiator.