Nature Structural & Molecular Biology 14, 1 (2007).

In the version of this Editorial originally published, we incorrectly stated that the Protein Structure Initiative (PSI) represents 1%–3% of the total US National Institutes of Health operating budget. The PSI is funded by the US National Institute of General Medical Sciences (NIGMS) and is allocated 3% of the NIGMS annual operating budget. We apologize for this mistake.