NKA Mutant Mice (IMAGE) University of Leeds Caption In an unfamiliar open arena, NKA mutant mice showed greater exploration, similar to the increased exploration exhibited by manic humans in an unfamiliar environment. Credit University of Leeds 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.