- AACompIdent 
 
 - Identify a protein by its amino acid composition
 - AACompSim 
 
 - Compare the amino acid composition of a Swiss-Prot entry with all other entries
 - MultiIdent 
 
 - Identify proteins with pI, Mw, amino acid composition, sequence tag and peptide mass fingerprinting data
 - PeptIdent 
 
- Identify proteins with peptide mass fingerprinting data, pI and Mw
Experimentally measured, user-specified peptide masses are compared with the theoretical peptides calculated for all proteins
in Swiss-Prot, making extensive use of database annotations
 - TagIdent 
 
 - Identify proteins with pI, Mw and sequence tag, or generate a list of proteins close to a given pI and Mw 
 -  FindMod 
  - Predict potential protein post-translational modifications and potential single amino acid
substitutions in peptides. Experimentally measured peptide masses are compared with the theoretical peptides calculated from a specified
Swiss-Prot entry or from a user-entered sequence, and mass differences are used to better characterize the protein of
interest.
 -  GlycoMod 
  - Predict possible oligosaccharide structures that occur on proteins from their experimentally determined masses (can be
used for free or derivatized oligosaccharides and for glycopeptides)
 
 -  GlycanMass 
  - Calculate the mass of an oligosaccharide structure 
 -  FindPept 
  -  Identify peptides that result from unspecific cleavage of proteins from their experimental masses,
taking into account artefactual chemical modifications, post-translational modifications (PTM) and protease autolytic
cleavage
 -  PeptideMass 
  - Calculate masses of 
peptides and their post-translational modifications for a Swiss-Prot or TrEMBL entry or 
for a user sequence
 -  PeptideCutter 
  - Predicts potential protease and cleavage sites and sites cleaved by chemicals in a given protein sequence
 
  - PepMAPPER
- Peptide mass fingerprinting tool from UMIST, UK
 - Mascot
 - Peptide mass fingerprint, sequence query and MS/MS ion search from Matrix Science Ltd., London
 - PepSea
- Protein identification by peptide mapping or peptide sequencing from Protana, Denmark
 - PeptideSearch
 - Peptide mass fingerprint tool from EMBL Heidelberg
 - ProteinProspector
 - A variety of tools from UCSF (MS-Fit, MS-Tag, MS-Digest, etc.) for mining sequence databases in conjunction with mass spectrometry experiments
[Mirrors at UCL-Ludwig, UK / Ludwig Institute Melbourne (Australia)]
 - PROWL
 - Protein chemistry and mass spectrometry resource from Rockefeller and NY Universities [or from Genomic Solutions]
 - PFMUTS
 - Shows the possible single and
double mutations of a peptide fragment from MALDI peptide mass fingerprinting
  - CombSearch 
 
 - An experimental unified interface to query several protein identification
tools accessible on the web
  
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