Authors: Ingo Drexler; Caroline Staib; Wolfgang Kastenmuller; Stefan Stevanović; Burkhard Schmidt; François A Lemonnier; Hans-Georg Rammensee; Dirk H Busch; Helga Bernhard; Volker Erfle; Gerd Sutter Journal: Proc Natl Acad Sci U S A Date: 2002-12-23 Impact factor: 11.205