previously , we demonstrated immunocytochemically that certain phenylethanolamine n-methyltransferase neurons in the inner nuclear layer of rat retina contain other catecholamine synthesizing enzymes , including tyrosine hydroxylase and aromatic-l-amino acid decarboxylase but not dopamine beta-hydroxylase ( dbh ) , the norepinephrine biosynthetic enzyme .
C0007412
catecholamine
C0028351
norepinephrine