Correction

NEUROBIOLOGY. For the article “Activation-dependent changes in receptor distribution and dendritic morphology in hippocampal neurons expressing P2X₂-green fluorescent protein receptors” by Baljit S. Khakh, W. Bryan Smith, Chi-Sung Chiu, Donghong Ju, Norman Davidson, and Henry A. Lester, which appeared in number 9, April 24, 2001, of Proc. Natl. Acad. Sci. USA (98, 5288–5293; First Published April 10, 2001; 10.1073/pnas.081089198), due to a printer's error, Baljit Khakh's e-mail was incorrectly listed as bsk@mrc-lmb.com.ac.uk. It should be bsk@mrc-lmb.cam.ac.uk.