Human Lymphocyte Cells. The three major types of lymphocyte are T cells, B cells and natural killer (NK) cells. These NK cells are a part of the innate immune system and play a major role in defending the host from both tumors and virally-infected cells. NK cells distinguish infected cells and tumors from normal and uninfected cells by recognizing changes of surface molecules. T-cells play a central role in cell-mediated immunity.
David Scharf is a buddhist, a guitarist, a scientist and artist who works nocturnally. He's also one of the world's leading names in electron microscope photography: those giant, luminescent photos of incredibly small things like bugs, dust, and nerves. His art's appeared in books, galleries, universities -- and the covers of Newsweek and National Geographic.
Off-Ramp producer Kevin Ferguson visited Scharf and toured his Echo Park home laboratory.