Mice Without the Enzyme OGT in Brain Cells Keep Eating (image) Johns Hopkins Medicine Share Print E-Mail Caption A normal mouse (left) stops eating when certain nerve cells in the brain signal to do so. Nerve cells missing the enzyme OGT don't signal, so those mice eat more at each meal and become obese (right). Credit Johns Hopkins Medicine Usage Restrictions None Share Print E-Mail 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.