Cancer Cell Cooperation (image) Johns Hopkins Medicine Share Print E-Mail Caption Cooperation between oxygen-poor cancer cells (red) and oxygen-rich ones (green) is illustrated. Credit Laboratory of Kenneth Pienta, Johns Hopkins. Usage Restrictions With 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.