News & Comment The View From the Community + See all authors and affiliations Science 06 Nov 1992:Vol. 258, Issue 5084, pp. 881DOI: 10.1126/science.258.5084.881 J. A. WhiteheadFind 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.