Functions as a transcriptional regulator. May function as a transcriptional repressor. Functions in the differentiation and the maintenance of the central serotonergic neurons. May play a role in cell growth. Specifically expressed in central serotonergic neurons. Also expressed in adrenal gland and to a lower extent in small intestine and eye. Earliest expression is detected at E12.5 in the developing brain in regions corresponding to the future rostral and caudal serotonergic neuron clusters. Belongs to the ETS family. Contaminating sequence. Sequence of unknown origin in the N-terminal part.