A Striking Degree of Abnormal Cell Growth (image) Brown University Share Print E-Mail Caption This image shows mammary tissue of control mice (left) and mice exposed as fetuses to 1,000 mg per kg of mother's body weight of MEHP, a common ingredient in plastics. (Black bar is 1 mm.) Credit Hixon Lab/Brown University Usage Restrictions Please credit. 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.