Nuclear receptor that binds DNA as a monomer to ROR response elements (RORE) (By similarity). Required for proper cerebellum development (PubMed:29656859). Expressed in the brain, in cerebellar-like structures, including Purkinje cells. At 2 dpf, strongly expressed in the developing eyes, as well as midbrain and hindbrain regions. In 3 dpf larvae, expressed in the upper rhombic lip. At 3 dpf, expression in the retina is weak and becomes spatially restricted in the inner nuclear layer. Weakly expressed in the forebrain region. Morpholino knockdown of the protein results in a reduced cerebellar area and smaller optic tecta area compared to control larvae. At 3 dpf, transgenic larvae present with a significantly decreased size of Purkinje and granule cell layers compared to controls. Belongs to the nuclear hormone receptor family. NR1 subfamily.