In Grimm et al Nature Cell Biol. 7, (2006) 1118–1123; the affiliation of one of the authors, Ulrike Müller, was incorrect. The correct affiliation is as follows:

Ulrike Müller 3,5

5Max Planck Institute for Brain Research, Deutschordenstrassen 46, D-60528 Frankfurt, Germany.

This error has been corrected online.