Authors: Almut Scherer; John Frater; Annette Oxenius; Juliet Agudelo; David A Price; Huldrych F Günthard; Martin Barnardo; Luc Perrin; Bernard Hirschel; Rodney E Phillips; Angela R McLean Journal: Proc Natl Acad Sci U S A Date: 2004-08-09 Impact factor: 11.205