These receptors
interact specifically with soluble chemicals, such as
sugars, amino acids, and repulsive (bitter-tasting) compounds.
All GRNs of the labial palps (LPs) and some of
the legs project axons to the subesophageal ganglion
(SOG) in the brain, the primary taste processing center,
but some axons of GRNs in the legs target the thoracic
ganglion