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The massXpert software package is a mass spectrometry environment for linear (bio-)polymers. It inherits all the innovations of GNU polyxmass. It allows the detailed definition of new polymer chemistries in the XpertDef module. These chemistry definitions are then used in the desktop calculator-like mass calculator (XpertCalc) and in the sophisticated polymer sequence editor and (bio-)chemical/mass spectrometric simulations module (XpertEdit). Available simulations include polymer and monomer chemical modifications, polymer sequence cleavage, gas-phase fragmentation, m/z ratio calculations, and more. License: GNU General Public License (GPL) Changes:
This release improves the flexibility of the monomer modification procedure: now it is possible to define a modification in the monomer modification dialog without the modification having to be defined in the polymer chemistry definition. This makes it much faster to test structural hypotheses. The polymer modifications are now easily visualized in the polymer sequence editor, and there they can be easily modified. The documentation has been updated.

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