Nature 444, 574–579 (2006), doi:10.1038/nature05282 and corrigendum Nature 494, 506 (2013); doi:10.1038/nature11976

In Fig. 4b of this Article, the gel for the loading control MyHC for the dog Varus was an unintentional duplication of the loading controls for the dog Vampire (which is correct). The correct gel is shown below in Fig. 1. The error does not affect any of our results and a University College London (UCL) committee appointed by the Vice Provost for Research has investigated the data presented in this Article and is satisfied of its authenticity.

Figure 1
figure 1

This is the corrected lower-left panel of Fig. 4b of the original Article.