Calcium Receptor (IMAGE) American Chemical Society Caption A section of a rat tongue stained for the calcium-sensing receptor, CaSR, which is in the central, bright green onion-shaped taste bud. Credit Michael Tordoff Usage Restrictions None 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.