addFixedModifications   Add fixed modifications
addModifications        Add fixed and variable modifications to peptide
                        sequences
addVariableModifications
                        Add variable modifications
aminoacids              Amminoacids data set.
combineModifications    Combines consecutive modifications on amino
                        acids in peptide sequences.
convertAnnotation       Convert sequences from one annotation style to
                        another
elements                Elements data set.
getCanonicalSequence    Get canonical sequence from any peptidoform
getModificationsCounts
                        Extract modification counts from one or more
                        peptide sequences
modifications           Modifications data set.
PTMods-package          Managing amino acid modifications for mass
                        spectrometry in R.
