Assertion: albinism's amount | /r/HasProperty | released after enzymatic conversion
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text: or (b) by a radioactive biochemical assay in which the samples are incubated with a radiolabelled tyrosine precursor and the amount of radiolabel released after enzymatic conversion quantified spectrophotometrically.89 A negative result with either assay indicates OCA 1A, a positive result indicates OCA 1B, OCA 2, or OCA 3.