Receptor that is required in photoreceptors R1, R3, R4 and R6 during eye development; generation of the ganglion mother cell-2 (GMC-2) fate in the nb7-3 lineage, coinciding with the transition in the expression of HB to KR in the neuroblasts (NBs). Expressed in several embryonic tissues; dorsal vessel, oenocyte and fat body. CNS expression is dynamic and confined to temporally restricted subsections of the NB lineage; expressed in many NB and GMCs, but only a small number of neurons. Belongs to the nuclear hormone receptor family. NR2 subfamily.