This Week in Science This Week inScience See allHide authors and affiliations Science 08 Jul 1988:Vol. 241, Issue 4862, pp. 139DOI: 10.1126/science.241.4862.139 Article Info & Metrics eLetters PDF This is a PDF-only article. The first page of the PDF of this article appears below.
Science Vol 241, Issue 486208 July 1988 Table of Contents Print Table of Contents Back Matter (PDF) Ed Board (PDF) Front Matter (PDF)