the rate of cyclic amp-dependent phosphorylation of phenylalanine 4-mono-oxygenase was inhibited only by those pterins [ ( 6r ) -bh4 , ( 6s ) -bh4 and 7,8-dihydrobiopterin ( bh2 ) ] that were able to decrease the potency and efficiency of phenylalanine as an allosteric activator of the hydroxylase .
C0030065
oxygenase
C0020364
hydroxylase