Taste Cells (IMAGE) University of Southern California Caption Taste cells at the back of the tongue, studied by USC Dornsife researchers. The red-colored cells detect sour taste and the green-colored cells detect bitter, sweet or umami. The cell nuclei are colored blue. Credit Yu-Hsiang Tu and Emily Liman 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.