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The CID tandem mass spectra for dp4 CSA and DS chains displaying differences in ion abundance and distributions. Product ions are singly-charged unless otherwise indicated in the annotation. The ions highlighted in red have been found to be diagnostic for this chain by other researchers. The fragment ions (shown in green) were found in this work and they are highly diagnostic for CSA and DS. Relative abundance of ion pair B2 and C2/Z2 also differ between the two chains.
