The authors regret that Fig. 3 was truncated in the original publication. Here we provide the complete original figure as submitted to the journal during peer-review of the manuscript.
The authors would like to apologise for any inconvenience caused.
Contributor Information
Daniel Boehringer, Email: boehringer@mol.biol.ethz.ch.
Christopher H.S. Aylett, Email: c.aylett@imperial.ac.uk.

