Letters Reference Manager See allHide authors and affiliations Science 21 Aug 1987:Vol. 237, Issue 4817, pp. 824DOI: 10.1126/science.237.4817.824 EARL BEUTLERFind 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 237, Issue 481721 August 1987 Table of Contents Print Table of Contents Back Matter (PDF) Ed Board (PDF) Front Matter (PDF)
