Letters Whose Genes Are They and How Can We Identify Them? + See all authors and affiliations Science 08 Nov 1996:Vol. 274, Issue 5289, pp. 904DOI: 10.1126/science.274.5289.904a Ivo G. GutFind 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.