Binds to a DNA sequence element required for the expression of the dopa decarboxylase gene (Ddc) in specific dopaminergic neurons. Could also play an early role in specific ectodermal cells, and a subsequent role in the embryonic nervous system. Coexpressed with acj6 in overlapping subsets of neurons in the embryonic epidermis and central nervous system. First detected in the precursor of the tracheal pits and the stomodeal invagination and later in the peripheral nervous system. Expressed at maximal levels in early embryos (6-12 hours). Expressed at lower levels during development. Belongs to the POU transcription factor family. Class-3 subfamily. Was originally thought to interact with acj6.