NEUROSCIENCE Correction for “Sonic hedgehog signaling is decoded by calcium spike activity in the developing spinal cord,” by Yesser H. Belgacem and Laura N. Borodinsky, which appeared in issue 11, March 15, 2011, of Proc Natl Acad Sci USA (108:4482–4487; first published February 28, 2011; 10.1073/pnas.1018217108).
The authors note that the following statement should be added to the Acknowledgments: “This work was supported by a grant to L.N.B. from the National Science Foundation.”