In the paper of Rodríguez et al. (2005), the label in Fig. 2 was incorrect. It should read ∼60 kDa, not 68kDa. Similarly, the mention of Fig. 2 in the ‘Antibody’ section of ‘Materials and methods’ should refer to 60 kDa (not 68 kDa). The authors apologise for any inconvenience caused, and we reproduce the corrected Fig. 2 in full here.