In the above article [Massink A, Gutiérrez-de-Terán H, Lenselink EB, Ortiz Zacarías NV, Xia L, Heitman LH, Katritch V, Stevens RC, and IJzerman AP (2015) Mol Pharmacol 87(2):305–313; DOI:10.1124/mol.114.095737], the following funding information was omitted:

This work was supported by the National Institutes of Health [Grant U54GM094618].

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

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