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: Supplementary Information

IDENTIFIERS

: Thomas Swift (ORCID)

: Thomas Swift (ResearcherID)

: Mark Geoghegan (ORCID)

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: The Royal Society of Chemistry has an exclusive publication licence for this journal

OPEN ACCESS: This article is freely available. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence (CC BY 3.0)

PUBLICATION HISTORY

: Received 1 November 2015; Accepted 21 January 2016; Advance Article published 29 January 2016; Version of Record published 23 February 2016