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Heintz C, Troxler H, Martinez A, Thöny B, Blau N. Quantification of phenylalanine hydroxylase activity by isotope-dilution liquid chromatography–electrospray ionization tandem mass spectrometry. Molecular Genetics and Metabolism. 2012 Apr;105(4):559–65. doi: 10.1016/j.ymgme.2011.12.025. |