Expression of Concern: Activation of the AMP-activated protein kinase by the anti-diabetic drug metformin in vivo: Role of mitochondrial reactive nitrogen species.

VOLUME 279 (2004) PAGES 43940–43951

The publisher of the Journal of Biological Chemistry is issuing an Expression of Concern to inform readers that credible concerns have been raised regarding some of the data and conclusions in the article listed above. The Journal of Biological Chemistry will provide additional information as it becomes available.