Erratum

The text of the Perspective by M. I. Masana and M. L. Dubocovich contained an error that appeared on page 2 Line 22 of the PDF. 4P-CADOT was attributed with properties that it did not possess. The statement "Luzindole, 4P-PDOT, and 4P-CADOT are MT1 inverse agonists." is incorrect and should read "Luzindole and 4P-PDOT are MT1 inverse agonists."

The online display has been corrected. A corrected PDF is available starting February 26, 2002 from http://stke.sciencemag.org/cgi/reprint/OC_sigtrans;2001/107/pe39.pdf