Drug Interaction with TAS2R14 Receptor (IMAGE) University of South Florida (USF Health) Caption High-resolution fluorescent confocal images showing human airway smooth cells exposed to three different drugs over 15 hours: The drug diphenhydramine (DPD), bottom row, retains more TAS2R14 bitter taste receptors (red) on the cell surface, undergoing less degradation than the receptors interacting with the drugs chlorhexidine (CLX) and flufenamic (FFA). The more pronounced yellow in middle and upper right frames represents co-localization of the receptor (red) and an endosome marker (green), meaning that the receptors binding to CLX and FFA have already been taken inside the cells and are on a path to being degraded. Credit Images generated by instrumentation in the Microscopy Core at the University of South Florida Byrd Alzheimer's Center Usage Restrictions Use caption with appropriate image and credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.