Microbial Mat (IMAGE) DOE/Pacific Northwest National Laboratory Caption A chunk of the microbial mat from Hot Lake that is under study by PNNL researchers. The lake is near Oroville, Wash., close to the Canadian border. Credit Photo courtesy of PNNL Usage Restrictions Please use credit info. 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.