TIS granules and ER (IMAGE) Memorial Sloan Kettering Cancer Center Caption A fluorescent microscopy image of a cell, with TIS granules shown in red and the endoplasmic reticulum is shown in green. The central black area is the cell’s nucleus. Credit Mayr Lab / Memorial Sloan Kettering Cancer Center Usage Restrictions attribution License Original 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.