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(a) MALDI-TOF mass spectrum (positive ionization mode) of an organic hen egg yolk extract recorded in the presence of DHB; (b) MALDI-TOF mass spectrum (negative ionization mode) of an organic hen egg yolk extract using 4-nitroaniline (PNA). Both spectra were recorded under exactly the same conditions and in the same solvents. More detailed assignments are available in (reprinted and modified with permission) [136].
