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© 2015 Elsevier BV. This is the post print version of the following article: Linko, Veikko & Ora, Ari & Kostiainen, Mauri A. 2015. DNA Nanostructures as Smart Drug-Delivery Vehicles and Molecular Devices. Trends in Biotechnology. Volume 33, Issue 10. 586-594. ISSN 0167-7799 (printed). DOI: 10.1016/j.tibtech.2015.08.001, which has been published in final form at http://www.sciencedirect.com/science/article/pii/S0167779915001614.