Authors: Chris Morris; Anne Pajon; Susanne L Griffiths; Ed Daniel; Marc Savitsky; Bill Lin; Jonathan M Diprose; Alan Wilter da Silva; Katya Pilicheva; Peter Troshin; Johannes van Niekerk; Neil Isaacs; James Naismith; Colin Nave; Richard Blake; Keith S Wilson; David I Stuart; Kim Henrick; Robert M Esnouf Journal: Acta Crystallogr D Biol Crystallogr Date: 2011-03-18