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Serum immunoglobulin A (IgA) levels in ataxia telangiectasia patients. IgA levels in 46 group A patients [with no ataxia telangiectasia mutated (ATM) kinase activity] and 19 group B patients (some residual ATM kinase activity). Limit of detection for IgA was 0·07 g/l. Age-related normal reference ranges are taken from Protein Reference Unit Handbook of Clinical Immunochemistry, 8th edition [17].
