Correction to: Cancer Gene Therapy (2007) 14, 74–81. doi: 10.1038/sj.cgt.7700990
Since the publication of the above article, the authors have identified an error in the title of Figure 4d. The correct title, WiDr: PBS, is shown below. The authors would like to apologize for this mistake.
The online version of the original article can be found at 10.1038/sj.cgt.7700990