Retraction to: Spinal Cord (2016) 54, 933–941; doi:https://doi.org/10.1038/sc.2016.36; published online 22 March 2016

The following paper has been retracted after a reader queried the accuracy of the figures. The authors have conceded that Figures 4, 5 and 6 misrepresent the data. It stated in the original paper that the different images in each figure were from different animals. However, these were from just one animal.