Authors: Grischa R Meyer; David Aragão; Nathan J Mudie; Tom T Caradoc-Davies; Sheena McGowan; Philip J Bertling; David Groenewegen; Stevan M Quenette; Charles S Bond; Ashley M Buckle; Steve Androulakis Journal: Acta Crystallogr D Biol Crystallogr Date: 2014-09-30