Abstract
An 8-year-old boy with late onset multiple carboxylase deficiency is described. Biotinidase deficiency and holocarboxylase-synthetase deficiency have been excluded. A very slow biochemical response to biotin was found. The decrease in urinary organic acid excretion followed first-order kinetics with a half-life of about 50 days. The initially low carboxylase activities in thrombocytes were increased but not normalized after 3 months of treatment.
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