. Author manuscript; available in PMC: 2020 Jul 29.
Published in final edited form as: Biochim Biophys Acta. 2015 Oct 27;1857(1):72–78. doi: 10.1016/j.bbabio.2015.10.011
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)