Phenylketonuria is a condition in which phenylalanine to tyrosine conversion is diminished because the enzyme phenylalanine hydroxylaze is deficient.

• 苯丙酮酸尿症是一种由于苯丙氨酸羟化酶缺乏，苯丙氨酸转变成酪氨酸的过程被削弱的