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“At a concentration of 0.5 mM, TU was found to totally inhibit melanin formation by tyrosinase catalyzed oxidation of 0.25 mM tyrosine in phosphate buffer at pH 6.8.”
“There is no doubt that the primary action of propjdthiouracil PTU ) and other drugs of the thiocarbamide series on the thyroid is an interference with the iodination of tyrosine.”