Probable gustatory receptor which mediates acceptance or avoidance behavior, depending on its substrates (By similarity). Has also atypical sensory function in organ not limited to conventional taste sensing like abdominal ganglions. Expressed in the adult labellar chemosensory neurons and in abdominal ganglions. In larvae, is expressed in neurons of the dorsal and posterior pharyngeal sense organs. Belongs to the insect chemoreceptor superfamily. Gustatory receptor (GR) family. Gr2a subfamily.