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Reconstructed mass spectra of H4 from Figure 1 using the Xtract deconvolution software (Thermo FisherScientific, San Jose, CA). (A): The H4 profile obtained without TFA, (B): The H4 profile with TFA present. Data were collected on an LTQ Orbitrap XL. TFA adduct formulas, observed and expected masses are listed in Supporting Information Table S2.
