it is concluded that `` '' peripheral '' '' tetrahydrobiopterin deficiency is caused by a partial pts deficiency with sufficient activity to cover the tetrahydrobiopterin requirement of tyrosine 3-hydroxylase and trytophan 5-hydroxylase in brain but not enough for phenylalanine 4-hydroxylase in liver .
C0041491
f tyrosi
C0020364
5-hydroxyla