The incorrect figure of ERK phosphorylation was published in Fig. 3 despite all correct figures supplied to the journal at the time of peer review. This resulted in the entire figure for JNK phosphorylation appearing in both Figs. 3 and 4. This was unfortunately not detected at the proof stage. The correct figure for ERK phosphorylation now appears in Fig. 3 online. The authors would like to apologize for any inconvenience caused.