Fig. 6. Adult co-expression of two different DH receptors in neurons producing the neuropeptide corazonin. (A) The central brain of adult flies expressing lacZ under the control of CRZ::GAL4 (left), and double-labeled for anti-ß-gal and for anti-CG17415 (DH-31-R1). All CRZ neurons express CG17415 (arrowhead) but there were two to four CG17415 neurons in the dorsal brain that did not express CRZ. (B) Brains from the same cross, double-labeled for anti-ß-gal and anti-CG8422 (DH-44-R1). As for CG17415, all CRZ neurons express CG8422 (arrowhead). In addition, three to four CRZ-negative, 8422-positive neurons were present. (C) Diagram of the adult brain CNS summarizing the large-scale coincidence of CG17415, CG8422 and CRZ expression patterns.