ConnectedComponents     Connected components
PSM                     A class for peptide-spectrum matches
PSMatch                 PSMatch: Handling and Managing Peptide Spectrum
                        Matches
addFragments            Adds MS2 Fragments
adjacencyMatrix         Convert to/from an adjacency matrix.
calculateFragments      Calculate ions produced by fragmentation
describeProteins        Describe protein and peptide compositions
filterPSMs              Filter out unreliable PSMs.
getAminoAcids           Amino acids
getAtomicMass           Atomic mass.
