Cardioactive peptide. Corazonin is probably involved in the physiological regulation of the heart beat. Clock (Clk) and cycle (cyc) proteins negatively regulate Crz transcription in a cell-specific manner (By similarity). Expression is restricted to 24 neurons in the larval CNS (8 in the brain and 16 in the ventral nerve cord) and 12-16 neurons in the pars lateralis of the adult brain. Belongs to the corazonin family.