"Reprinted from the Proceedings of the National Academy of Sciences of the United States of America, vol. 96, p. 5905-6008, May 25, 1999"--P. opposite t.p.
Bibliography
Includes bibliographical references.
Reproduction
Electronic reproduction. Ann Arbor, MI : ProQuest, 2015. Available via World Wide Web. Access may be limited to ProQuest affiliated libraries.