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Allophycocyanin dissociates differentially in solution and in the gas phase. Mass spectrum in region 1600–3300 m/z of allophycocyanin upon (a) gas-phase dissociation and in-solution dissociation at (b) pH 7 and (c) pH 2.5. The inserts show a zoom in on the 10+ charge state highlighting which monomer was observed. The m/z positions of the alpha (blue) and beta (red) subunits are highlighted
