President Barack Obama looks through a microscope during a tour of an oncology laboratory at the National Institutes of Health in Bethesda, Md., Sept. 30, 2009. Others present include Dr. Marston Linehan, left, Dr. Francis Collins, Director of NIH, second from right, and Health and Human Services Secretary Kathleen Sebelius.

President Barack Obama looks through a microscope during a tour of an oncology laboratory at the National Institutes of Health in Bethesda, Md.,  Sept. 30, 2009.  Others present include Dr. Marston Linehan, left, Dr. Francis Collins, Director of NIH, second from right, and Health and Human Services Secretary Kathleen Sebelius.