This Week in Science This Week in SCIENCE By RUTH LEVY GUYER See allHide authors and affiliations Science 08 Nov 1991:Vol. 254, Issue 5033, pp. 775DOI: 10.1126/science.254.5033.775 RUTH LEVY GUYERFind this author on Google Scholar Find this author on PubMed Search for this author on this site Article Info & Metrics eLetters PDF This is a PDF-only article. The first page of the PDF of this article appears below.
Science Vol 254, Issue 503308 November 1991 Table of Contents Print Table of Contents Back Matter (PDF) Ed Board (PDF) Front Matter (PDF)
