Transcription factor that may play important roles in patterning the embryonic brain. Predominantly expressed in the embryonic and adult central nervous system. In adults, isoform 2 is expressed in the brain, ovary, basal cells of the skin and muscle satellite cells. Isoform 2 is expressed both maternally and zygotically, and is the major isoform in adults. Isoform 1 and isoform 3 are expressed zygotically. Maximal expression is after 1 to 2 days of development and becomes down-regulated as cells differentiate. Belongs to the POU transcription factor family. Class-3 subfamily.