Molecular Virology and Gene Therapy, KU Leuven, Leuven, Flanders, Belgium

Correspondence to Zeger Debyser, KU Leuven Faculty of Pharmaceutical Sciences: Katholieke Universiteit Leuven, Faculteit Farmaceutische Wetenschappen, 3000 Leuven, Belgium. Tel: +32 16 37 40 29; e-mail: [email protected] or [email protected]