Primary funding was provided by the Department of Energy, Office of Basic Energy Sciences, Biomolecular Materials Program under grants DE-SC0019355 and DE-SC0019282. D.J.P. and N.S. acknowledge stipend support and support for neutron-scattering experiments under cooperative agreements 70NANB12H239 and 70NANB17H302 from the National Institute of Standards and Technology (NIST), US Department of Commerce. D.J.P. and N.S. also acknowledge the support of the NIST in providing neutron research facilities. Neutron facilities are supported in part by the National Science Foundation (NSF) under agreement DMR-0944772. We acknowledge the support of the National Institutes of Health (NIH), grant RO1 EB006006, and the University of Delaware NIH Centers of Biomedical Research Excellence (COBRE) grants 1P30.GM110758 and 1P20.RR017716 for instrument resources. We acknowledge the Delaware IDeA Network of Biomedical Research Excellence grant P20 GM103446 for support of the Delaware Biotechnology Institute. J.G.S. acknowledges partial support from NSF CHE 1709518 and the Penn Laboratory for Research on the Structure of Matter (MRSEC; grant NSF DMR-1120901). D.J.P. and J.L. acknowledge stipend support from the NSF under grant DMREF-1629156. D.J.P., J.G.S., Y.T. and H.Z. acknowledge stipend support from the NSF under grants DMR-1234161 and DMR-1235084. The statements, findings, conclusions and recommendations herein are those of the authors and do not necessarily reflect the view of NIST, the US Department of Commerce, the US Department of Energy, or the University of Delaware. D.W., D.J.P. and C.J.K. acknowledge internal research support from the University of Delaware.