In the above article [Guo AM, Janic B, Sheng J, Falck JR, Roman RJ, Edwards PA, Arbab AS, and Scicli AG (2011) J Pharmacol Exp Ther 338:421–429], a grant acknowledgement was inadvertently omitted from the footnote. The footnote should read “This work was supported by the American Heart Association [Grant 11SDG6870004] (to A.M.G), [Grant 09SDG2230011] (to B.J.); the National Institutes of Health National Heart, Lung, and Blood Institute [Grants HL036279, HL029587] (to R.J.R.); the National Institutes of Health National Cancer Institute [Grants R01-CA122031, R21-CA129801-01A1] (to A.S.A.); the National Institutes of Health National Institute of General Medical Sciences [Grant GM31278] (to J.R.F.); and the Robert A. Welch Foundation [Grant GL625910] (to J.R.F.).”

The authors regret this error and apologize for any confusion and inconvenience it may have caused.

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