Cancerous B Cells Treated with Rituximab (image) University of Manchester Caption This image shows cancerous B cells that have been treated with rituximab. The protein CD20 (shown in green) has been drawn to the side of the cells. When the Natural Killer white blood cells approach they will stand an 80 percent chance of killing the cell if they latch on to the side where the protein has collected. Credit MCCIR Usage Restrictions None 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.