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Influence of basic residues on the c-terminal rearrangement of peptides in gas phase Gonzalez, Javier; Besada, Vladimir; Garay, Hilda; Reyes, Osvaldo; Tambara, Yanet; Takao, Toshifumi; Shimonishi, Yasutsugu & Padron, Gabriel Abstract We designed and synthesized a set of peptides in order to study some factors that could affect the appearance of this fragmentation such as the position of the basic residue within the sequence, the nature of the amino acids involved in the rearrangement and the way in wich the different basicity of two isobaric amino acids such as lysine and glutamine could be helpful to differentiate them taking into account the intensities ratio of bn-1/bn-1+18.

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