Correction to: Cell Research (2011) 21:1452-1469. doi:10.1038/cr.2011.60; published online 5 April 2011
The authors apologize for the wrong β-actin blot in Figure 4Ai. The Figure 4Ai with the correct β-actin blot is as follows:

The authors would also like to update the current addresses for two of the authors in this corrigendum.
Nariman A B Balenga: Molecular and Signal Transduction Section, Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD.
E-mail: nariman.balenga@nih.gov
Maria Waldhoer: Hagedorn Research Institute, Novo Nordisk, A/S, Niels Steensensvej 6, DK-2820 Gentofte, Denmark.
E-mail: mriw@hagedorn.dk
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The online version of the original article can be found at 10.1038/cr.2011.60
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Balenga, N., Aflaki, E., Kargl, J. et al. Erratum: GPR55 regulates cannabinoid 2 receptor-mediated responses in human neutrophils. Cell Res 21, 1641 (2011). https://doi.org/10.1038/cr.2011.169
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DOI: https://doi.org/10.1038/cr.2011.169