Acknowledgements
M Mraz thanks TJ Kipps (UCSD) for inspiring discussions.
Financial & competing interest disclosure
The work was supported by IGA MZCR NT11218-6/2010, OPVK project SuPReMMe-CZ.1.07/2.3.00/20.0045 and VaVPI project CEITEC – CZ.1.05/1.1.00/02.0068. The authors have no other relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript apart from those disclosed.
No writing assistance was utilized in the production of this manuscript.