Hundreds of organs and tissues preserved after autopsies on Bhopal gas tragedy victims have mysteriously gone missing from state's Medico Legal Institute (MLI). Madhya Pradesh government had decided to preserve these samples for investigation and long-term clinical studies on health effects of toxic gas exposure...Samples were crucial evidence in pending criminal cases against Union Carbide India Ltd (UCIL), which is behind the world's worst industrial disaster. It was important to preserve the tissues till the case is decided...Social activists working for gas victims claim these samples should have been preserved legally, medically and ethically.