Genome-Wide Identification of 5-HT Receptor Gene Family in Razor Clam and Their Circadian Rhythm Expression Analysis.

Serotonin (5-HT) is primarily distributed in the gastrointestinal and central nervous systems, where it plays a crucial role in regulating various physiological functions such as digestion, reproduction and establishing animal emotions. 5-HT is an effective oxytocin widely used in molluscan aquaculture, and its physiological functions are performed by binding to corresponding 5-HT receptors (5-HTRs). In this study, seven genes of () were identified and analyzed, and they were designated as , , , , , and .