Engineering Chromosomes (IMAGE) Cold Spring Harbor Laboratory Caption The Mills group altered normal cells so that they had one extra- (left) or one fewer- (right) copies of a chromosome segment representing human 1p36 than normal cells; this caused added tumor suppression and increased cancer, respectively. Credit Cold Spring Harbor Laboratory 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.