Breadcrumb Home Teitell comments on ‘From One, many genetically different embryonic stem cells’ in Nature Reports Stem Cells Teitell comments on ‘From One, many genetically different embryonic stem cells’ in Nature Reports Stem Cells November 26, 2008 1 min read Monya Baker, November 2008 / Nature Reports Stem Cells — Copy number variants crop up in routine ES cell culture.