If you think something dramatic is happening in this photo, you’re right. The red cells are metastatic melanoma within a lymph node. This cancer is being surrounded by lymph cells, specifically T cells, as part of the body’s immune system response. It’s this type of action that mayo Clinic researchers hope to enhance to attack various forms of cancer. Thanks to Svetomir Markovic, M.D., Ph.D., and his team for the image. Read more about Mayo’s cancer research in Cleaning Up Cancer.