This domain family is found in Corazonin proteins in Drosophila and other Anthropods. Corazonin (Crz)is a neuropeptide with a wide spectrum of biological functions in diverse insect groups. It was first discovered due to its myostimulatory activities on the heart muscle of Periplaneta Americana and the hyper-neural muscle of Carausius morosus [1]. In Drosophila melanogaster, Crz plays diverse roles ranging from a regulator of insulin producing cells in the brain to roles specific to tissues, life stages, and gender [2].

1: Evolution of the AKH/corazonin/ACP/GnRH receptor superfamily and their ligands in the Protostomia. Hauser F, Grimmelikhuijzen CJ; Gen Comp Endocrinol. 2014;209:35-49. PMID:25058364

2: Developmental regulation and functions of the expression of the neuropeptide corazonin in Drosophila melanogaster. Lee G, Kim KM, Kikuno K, Wang Z, Choi YJ, Park JH; Cell Tissue Res. 2008;331:659-673. PMID:18087727