EcollacZdpr1-1 expression is associated with chemosensory, and not mechanosensory, external sensory organs. Expression is observed in chemosensory bristles of the anterior wing margin, and gustatory sensory organs of the labellum. EcollacZdpr1-1 expression is observed in olfactory sensilla of the maxillary palps, but not in olfactory sensilla of the third antennal segment. Expressopm is also observed in photoreceptor cell R8, and in a subset of neurons in the thoracic ganglion, brain, and optic lobes, suggesting neuronal expression.