Sequence-specific transcription factor which is part of a developmental regulatory system that provides cells with specific positional identities on the anterior-posterior axis. Part of the nuclear protein complex gamma-globin promoter and enhancer binding factor (gamma-PE) composed at least by SATB1 and HOXB2. At 8 dpc, expressed in the developing hindbrain in regions that give rise to rhombomeric segmentations r3, r4 and r5. Belongs to the Antp homeobox family. Proboscipedia subfamily.