. Author manuscript; available in PMC: 2022 Jan 3.
Published in final edited form as: Prog Biophys Mol Biol. 2021 Mar 3;163:143–159. doi: 10.1016/j.pbiomolbio.2021.02.004
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).