Affiliation: | aDepartment of Cell and Developmental Biology, University College London, London WC1E 6BT, UK;bDepartment of Structural and Molecular Biology, University College London, London WC1E 6BT, UK;cDepartment of Pharmacology, University of Minnesota Medical School, Minneapolis, Minnesota 55455, USA;dCenter for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093-0202, USA |