KO ADP model (IMAGE) University of California - Irvine Caption Induced pluripotent stem cell-derived microglia (iPSC-microglia) deficient in TREM2 and expressing the genetically encoded calcium indicator, Salsa6f. This red-green tandem indicator stably labels the microglial cell in red (tdTomato) and increases its green intensity (GCaMP6f) with rise in cytosolic calcium. The image shows enhanced calcium signaling and process extension in response to purinergic agonist stimulation (ADP). Credit School of Medicine / UCI Usage Restrictions N/A 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.