BSX(Brain-specific homeobox protein homolog) may play a role in the determination and function of cell types in the brain. In brain, it is restricted to a few specific developing brain structures such as pineal gland, telencephalic septum, hypothalamic pre-mammillary body and arcuate nucleus. Bsx might be considered an important molecular marker for early embryonic stages of epiphysis development. It belongs to the distal-less homeobox family and contains 1 homeobox DNA-binding domain.