Journal of Cell Science was informed that several bands in each of the ERK1/2, P-AKT, AKT and p70S6K blots in Fig. 5 look very similar. After discussions with the first author, Raffaella Guerriero, who was unable to locate the original data, the journal referred this matter to the Istituto Superiore di Sanità. As the institute does not have a suitable body to investigate this matter, the journal is publishing this Expression of Concern to alert readers to issues with the western blots shown in Fig. 5. Without the original full blots and an impartial investigation by the institute, the journal cannot determine whether the results and conclusions reported in the paper are compromised.
The authors apologise to readers for any inconvenience caused.
