Correction: In the March 15, 1997, issue, the authors inadvertently omitted a reference in the article by Frank Johnson et al. (pp 2101–2111). The reference is as follows: Yan Q, Rosenfeld RD, Matheson CR, Hawkins N, Lopez OT, Bennet L, Welcher AA (1997) Expression of brain-derived neurotrophic factor protein in the adult rat central nervous system. Neuroscience, in press.