1 Department of Biological Sciences and Bioengineering, Wellcome Trust DBT India Alliance, Indian Institute of Technology, Kanpur 208016, India. Electronic address: arshukla@iitk.ac.in.
2 Structural Biology Research Centre, Vlaamse Institute for Biotechnology (VIB), Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium. Electronic address: Shoshana.Wodak@gmail.com.