POU3F3 (POU Class 3 Homeobox 3): POU3F3 is a member of the POU family of transcription factors, involved in regulating gene expression during nervous system development. It plays a key role in the differentiation and maintenance of neural progenitor cells, influencing the formation of various brain regions. Mutations or dysregulation of POU3F3 have been linked to neurodevelopmental disorders and may contribute to certain psychiatric conditions.