Extending biochemical databases by metabolomic surveys.

VOLUME 286 (2011) PAGES 23637–23643

PAGE 23642:

Ref. 25 should read as follows: Smith, C. A., O'Maille, G., Want, E. J., Qin, C., Trauger, S. A., Brandon, T. R., Custodio, D. E., Abagyan, R., and Siuzdak, G. (2005) Ther. Drug Monit. 27, 747–751.