Nature, 411, 590–595 (2001).

In this Letter, the following sentence should have appeared in the Acknowledgements section: “We gratefully acknowledge technical advice, the MerCreMer plasmid1, and the MerCreMer transfected DT-40 cell line necessary for the creation of the Cre-Lox inducible LTRPC7 knockout cell lines from M. Reth and T. Brummer”.