Abstract
To the Editor: The analysis of rates of sister-chromatid exchange (SCE) has been shown to be a sensitive method of measuring DNA damage.1 SCE is increased after exposure to many mutagens and carcinogens2 and in some viral illnesses.3 During a study of persons exposed to a variety of environmental agents during pregnancy, we encountered a woman with multiple sclerosis (MS) who had an unexplained elevation of SCE. This incidental finding was followed up, and it was found that SCE is increased in MS.Volunteers were sought from the South Australian MS-rehabilitation unit, and blood samples were collected from inpatients with . . .

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