Bror Erik Strandberg (1930-2018).
Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India, Biochemistry and Structural Biology, Lund University, Box 117, Lund, 22100, Sweden, Department of Cell and Molecular Biology, Uppsala University, Biomedical Center, Box 596, SE-751 24 Uppsala, Sweden, and Hockmeyer Hall of Structural Biology, Purdue University, West Lafayette, IN 47907-1971, USA. *Correspondence e-mail: anders@liljas.net