Abstract
1. 1. A method has been presented for the measurement of tyrosine hydroxylase using a reaction coupled to aromatic l-amino acid decarboxylase. 2. 2. The specificity of the assay has been demonstrated in experiments in which various factors that influence either tyrosine hydroxylase or aromatic l-amino acid decarboxylase activity were omitted. 3. 3. The validity of the assay has been shown by the close agreement between the moles of CO 2 produced and the moles of dopa formed, as well as the loss of all activity when the essential cofactors are omitted. 4. 4. The sensitivity of the method has been shown to be greater in our laboratory than tyrosine hydroxylase assays currently used.
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