Implications for Gene Therapy H. L. Davis Oligonucleotides: Molecular Versions for Optimal Use in Vivo 31 E. Saison-Behmoaras, A. Van Aerschot, I. Duroux, C. Hendrix, C. Helene, and P. Herdewijn Retrovirus Vectors in Gene Therapy: Targeting to Specific Cells 45 AJ. Kingsman, Y. Bae, J. c. Griffiths, N. Kim, E. E. Ramsdale, G. Romano, Y. Soneoka, P. M. Cannon, and S. M. Kingsman Adenovirus as Vectors for Gene Therapy 53 M. G. Lee Receptor-Mediated Gene Delivery with Synthetic Virus-like Particles 67 E. Wagner, M. Cotten, and K. Zatloukal Controllable Gene Therapy: Recent Advances in Non-Viral Gene Delivery 79 A.