1126 Quick Test Kits (IMAGE) University of Wisconsin-Madison Caption A small molecule of the naltrexone, an opioid mimic, nestles neatly into a cavity — called a binding site — of a protein selected for just that purpose by UW–Madison researchers using a new quick and inexpensive way to create test kits for drugs, environmental toxins and other substances. Credit Image by Raman Lab/UW–Madison Usage Restrictions None 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.