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In the December ARCHIVES a typographical error appeared in thefirst paragraph of the editorial "Proton Magnetic ResonanceSpectroscopy: An In Vivo Window to Study Neurodegenerative Disorders"by Linfante and Ashizawa (Arch Neurol. 1999;56:1446-1447). Thesentence reading "The pulse sequence produces a signal decayin which the spins are percussing at a frequency determinedby the local magnetic field and ultimately by their chemicalrelationship with different compounds" should have read "Thepulse sequence produces a signal decay in which the spins areprecessing at a frequency determined by the local magnetic fieldand ultimately by their chemical relationship with differentcompounds." (Bold typeface added.) We regret the error.