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Chromatogram from the HPLC/MS/MS analysis of a porphyrin standard mixture. UP: uroporphyrin I; 7P: 7-carboxylporphyrin I; 6P: 6-carboxylporphyrin I; 5P: 5-carboxylporphyrin I; CP: coproporphyrin I; MPIX: mesoporphyrin IX; PPIX: protoporphyrin IX
