Cell Biology EducationVol. 3, No. 1 FEATURESFree AccessFrom the National AcademiesJay B. LabovJay B. LabovSearch for more papers by this authorPublished Online:13 Oct 2017https://doi.org/10.1187/cbe.04-01-0028AboutSectionsView articleView Full TextView PDF ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmail View articleFiguresReferencesRelatedDetailsCited by Vol. 3, No. 1 March 01, 20041-68 Metrics Downloads & Citations Downloads: 46 History Information© 2004 by The American Society for Cell BiologyI thank Bruce Alberts, Jennifer Saxon, and Steve Olson for contributing text and reviewing an early draft of this manuscript.PDF download