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. Expressed in whole embryos and fetuses at 5-9 weeks from conception. Belongs to the Antp homeobox family. Proboscipedia subfamily.