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Measurement of porphobilinogen in urine by a simple resin method with use of a surrogate standard.

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Is the Watson-Schwartz screening method for porphobilinogen reliable?

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Total porphyrin and coproporphyrin and uroporphyrin fractions in urine measured by second-derivative spectroscopy.

Assessment and optimization of kinetic methods for angiotensin-converting enzyme in plasma.

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Measurement of porphobilinogen in urine by a simple resin method with use of a surrogate standard.

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