Contents

30 July 1976
Vol 193, Issue 4251

About The Cover

Multiple fusion aggregate showing two small dark tobacco nuclei (the “eyes”), a superimposed HeLa cell (one “ear”), and two HeLa nuclei with the cell membrane apparently continuous with the protoplast membrane and no visible intervening membranes (about × 4440). See page 401. [William Marin, Jr., Brookhaven National Laboratory, Upton, Long Island, New York]