AUTHOR=Brunborg Gunnar , Collins Andrew , Graupner Anne , Gutzkow Kristine B. , Olsen Ann-Karin TITLE=Corrigendum: Reference cells and ploidy in the comet assay JOURNAL=Frontiers in Genetics VOLUME=8 YEAR=2017 URL=https://www.frontiersin.org/journals/genetics/articles/10.3389/fgene.2017.00004 DOI=10.3389/fgene.2017.00004 ISSN=1664-8021