VIRUSES

The structures of the components of large and complex viruses, determi ned over the past year, have demonstrated the great variation in the w ays in which viruses achieve their goals. The structure of the blueton gue virus coat protein provides clues as to how a T=13 particle is ass embled and the structure of the tick-borne encephalitis envelope prote in suggests a new way of exposing a membrane fusion peptide at the rig ht moment.