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137573 Biochemistry

An 8-month-old child is brought to a pediatrician because of the mother’s concern about the boy’s tendency to compulsively bite his fingers. On questioning, the mother repoed that she has noticed yellow-orange crystals in his diapers, but has not mentioned them to anyone. A genetic defect in which of the following pathways should be suspected?

AAromatic amino acid metabolism
BBranched chain amino acid metabolism
CPurine metabolism
DPyrimidine metabolism
Biochemistry
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