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. 2013 Jun 8;3:256–262. doi: 10.1016/j.fob.2013.05.004

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© 2013 The Authors

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-No Derivative Works License, which permits non-commercial use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig. 5 — Structure-based sequence alignment of pepsin, Mtb-AP and HIV proteinase. 3₁₀ helices are highlighted in yellow. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)