Question
A 24 month-old child is brought to a doctor by his parents. They explain with worry that after collecting the child’s urine for a routine urinalysis, the urine sample turned black on the way to the laboratory. The child has met all developmental milestones and has no significant past medical history. Which of the following conversion pathways are most likely deficient in this patient:
| A. |
Phenylalanine to tyrosine |
| B. |
Serine to cysteine |
| C. |
Histidine to glutamate |
| D. |
Tyrosine to fumarate |
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