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Arch Neurol. 2000;57:368.

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