Acknowledgements
Funding for this project was provided by the National Institutes of
Health, National Institute of General Medical Sciences (NIGMS-NIH,
#T32-GM008799) and the Defense Threat Reduction Agency (DTRA,
#HDTRA1-15-0054). Its contents are solely the responsibility of the
authors and do not necessarily represent the official views of the
NIGMS, NIH, or DTRA.