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. 2017 Jan 23;108(1):5–11. doi: 10.1111/cas.13116

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© 2016 The Authors. Cancer Science published by John Wiley & Sons Australia, Ltd on behalf of Japanese Cancer Association.

This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Memorial figures for Knudson. (a) The cover of the special issue of Genes Chromosomes & Cancer on Knudson's 80th birthday (December 2003; vol. 38, issue 4, with the permission of John Wiley & Sons, Inc.). (b) The plot from which Knudson proposed the two‐hit hypothesis (Ref. 2, with the permission of the National Academy of Sciences, USA).