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Photolysis of aggregated Aβ16–22·Aβ16–22-TFMD20 (365 nm) monitored by MS showing product distribution observed after 60 min; doubly charged heterodimer peaks from IMS–MS analysis are presented on the left. Calculated m/z for the monoisotopic, doubly charged heterodimer is 934.50; note the observed 0.5 m/z unit spacing of the isotope shifts indicating doubly charged ions.
