In the article “Evidence for Chelatable Zinc in the Extracellular Space of the Hippocampus, But Little Evidence for Synaptic Release of Zn,” by Alan R. Kay, which appeared on pages 6847-6855 of the July 30, 2003 issue, the wrong name, acronym, and structure of the transition metal chelator were inadvertently given. The chemical name of the chelator is ethylenediamine-N,N′-diacetic-N-N′-di-β-propionic acid rather than ethylenediiminodi-2-pentanedioic acid, and its acronym is EDPA rather than EDDG. EDPA is available from Aldrich as catalog number 28,584-6. In Figure 1a, the chemical structure should be replaced by the following one: Also, the first sentence on page 6852 should begin “If the value of fmax/fmin is....”
