Off Target Effects (IMAGE) Rockefeller University Caption When a mouse's immune system reacts to red blood cells infected with the malaria parasite (dark spots within some of the pink cells above), changes occur in the DNA of B lymphocytes. These alterations, though beneficial in protecting from malaria, can occasionally lead to cancer. Credit Laboratory of Molecular Immunology at Rockefeller University Usage Restrictions Image may only be used to illustrate the research described in the accompanying story. 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.