Acknowledgements
The author thanks J Chlebowska and A Piotrowska for excellent editorial help.
Financial & competing interests disclosure
This work was supported by the Nencki Institute statutory funds, the EU JPND grant 2/BIOMARKAPD/JPND/2012, and the Polish National Science Centre grant 2014/15/D/NZ4/04361. The author has 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.
No writing assistance was utilized in the production of this manuscript.