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. 2016 Mar 31;6:23845. doi: 10.1038/srep23845

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4-methylamino antipyrine (MAA), 4-aminoantipyrine (AA), 4-acetylamino antipyrine (AAA) and 4-formylamino antipyrine (FAA). Results are expressed as the mean + SD of stimulation index (SI). Patients (N = 16) and healthy controls (N = 15).