Nat. Biotechnol. 20, 651 (2002).
Because of a proofreading error, Julian D. Watts' name was incorrect in the author affiliations.
The correct affiliations are as follows: Ruedi Aebersold is cofounder and Julian D. Watts is a senior research scientist, Institute for Systems Biology, 1441 North 34th Street, Seattle, WA 98103 (email@example.com). We regret the error.
The online version of the original article can be found at 10.1038/nbt0702-651