Technical Comments Response + See all authors and affiliations Science 12 Mar 1993:Vol. 259, Issue 5101, pp. 1629DOI: 10.1126/science.259.5101.1629 Graziano FioritoFind 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 259, Issue 510112 March 1993 Table of Contents Print Table of Contents Back Matter (PDF) Ed Board (PDF) Front Matter (PDF)
