Correction to: Gene Therapy advance online publication, 12 May 2011; doi:10.1038/gt.2011.66

Since the online publication of this paper the authors have noticed that Figure 2 is incorrect. The Doppler data are missing in panels i and j. The correct figure is shown below.

Figure 2
figure 1

Muscle perfusion imaged by contrast pulse sequence (CPS) ultrasound technique in normal muscles (a–d) and after ischemia operation (eh). Native image after AAV-VEGF-A-A165 injection, asterisk indicates the location of the injection (a). CPS images from the same muscle 1 month (b) and 12 months (d) after AAV-VEGF-A-A165 gene transfer. Power Doppler image after AAV-VEGF-A-A165 gene transfer (c). Power Doppler (e) and CPS (f) images 6 months after ischemia operation and AAV-LacZ gene transfer. Power Doppler (g) and CPS (h) images 6 months after ischemia operation and AAV-VEGF-A-A165 gene transfer. Arrowheads in Doppler images indicate the signal from large vessels. Perfusion ratio to contralateral intact in normal muscles (i) and in ischemic muscles (j). Perfusion in VEGF-A-transduced muscle was increased compared with LacZ muscle already 1 week after gene transfer both in normoxic and in ischemic muscles. Results are presented as means±s.e.m., *P0.05, n=3.

The authors would like to apologise for this error.