Mouse and XMRV (image) NIH/National Cancer Institute Share Print E-Mail Caption This is a nude mouse with a grafted human prostate tumor (indicated by white bump near shoulder blade). XMRV arose from recombination event in this breed of mouse. Credit NIH/National Cancer Institute 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.