Folder: S.F. Colleges-University of San Francisco-Students, Staff.
On back: "The extraction of nuclear proteins in normal and cancerous tissues is accomplished at the University of San Francisco with the help of a refrigerated centrifuge. Dr. William Hovanitz (center) is shown demonstrating the centrifuge to Marco F. Hellman, president of the San Francisco County branch of the American Cancer Society, graduate student Virginia Madden is assisting Dr. Hovanitz."