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Characterization of the phycocyanobilin detected in spirulina extracts: (a) the LC-MS spectrum of phycocyanobilin (Compound 1, RT = 11.8 min), (b) the MS/MS spectrum of the [M+H]+ ion of phycocyanobilin, and a (c) schematic representation of the formation of major fragment ions from phycocyanobilin.
