A child with white hair, very pale skin, and blue eyes undergoes an ophthalmologic evaluation and is diagnosed with strabismus and 20/400 vision. The patient is otherwise healthy and demonstrates no evidence of neurologic defects. To account for these findings, which enzyme could be defective?
A. Cystathionine synthetase
B. Tyrosine hydroxylase
C. Homogentisic acid dioxygenase
D. Tyrosinase
E. Phenylalanine hydroxylase
A. Cystathionine synthetase
B. Tyrosine hydroxylase
C. Homogentisic acid dioxygenase
D. Tyrosinase
E. Phenylalanine hydroxylase
