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Published online by Cambridge University Press: 30 March 2004
There are errors in the chemical structures for Figure 1 as it was originally printed. There should be a carbon atom between the cyclopropyl ring and the phosphonate in both the trans cyclopropyl AP4 and the cis cyclopropyl AP4. Figure 1 is printed below as it should be.
(article appeared in Visual Neuroscience (2003), 20, 231–240)