Acetylator phenotype was determined in 22 patients with spontaneous systemic lupus erythematosus and the proportion of 'slow' acetylators compared with that obtained in a group of patients with rheumatoid arthritis and a group of healthy controls. 73% of the SLE group were designated 'slow' compared with 72% of the rheumatoid group and 64% of the control group. These differences were not significant.
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