Nature 389, 502–504 (1997); doi:10.1038/39062

It has come to our attention that Fig. 4 in this Letter presented three events of data duplication. In Fig. 4a the panels in row 1, columns 1 and 7 were the same, in Fig. 4a the panels in row 3, columns 5 and 7 were the same, and in Fig. 4c and e, the panels in columns 1–3 were the same. Given the time elapsed since publication, we could not locate the original raw data. The main conclusion illustrated by Fig. 4, however, of dose-dependent (Fig. 4d) and Gβγ-sensitive (Fig. 4f) activation of Gαi1 by AMPA in MIN6 cells, which do not express GluR6 (Fig. 4b), remains unaffected. Authors J.P.D. and P.M., now both retired, could not be reached. The original Letter has not been corrected online.

Correspondence should be addressed to Y.W. (yzwang@ion.ac.cn).