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ARTICLE PDF RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Problems of Ageing. _Nature_ 189, 21 (1961). https://doi.org/10.1038/189021b0 Download
citation * Issue Date: 07 January 1961 * DOI: https://doi.org/10.1038/189021b0 SHARE THIS ARTICLE Anyone you share the following link with will be able to read this content: Get shareable
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