ACKNOWLEDGEMENTS
This work was partially supported by the US National Institute of
General Medical Sciences (NIGMS/NIH) grant R01GM100482 (AK) and R35
GM141918 (to GTM); Biotechnology and Biological Sciences Research
Council (BBSRC) grant BB/S007105/1 (to DJR), and EMBO Installation Grant
No: 4421 (to EK). Many thanks to the experimentalists who provided the
ensemble targets.