Table 3. Identification of L-FABP.

MOWSE score	Number of matching peptides	Percent coverage	Protein MW (Da)	Protein pI	SwissProt Accession no.	Protein name
1045000	18	96	14 209	6.6	P07148	Liver fatty acid- binding protein
462	4	32	18 013	7.7	P05092	Peptidyl-prolyl cis–trans isomerase A
361	4	43	12 902	6.2	P23763	Vesicle-associated membrane protein 1

Example of an MS-Fit database search showing the identification of L-FAPB. The MOWSE score is much higher (225 times higher) for L-FABP compared with the next protein score. The ‘MOWSE score’ is a score based on how many peptides have been matched to the protein in the database and the accuracy of those matches, the higher the MOWSE score the better the hit; ‘no. of matching peptides’ is the number of experimentally obtained peptides that have been matched to theoretical peptides in the database; ‘Percent coverage’ is the percentage of the protein sequence covered by the matched peptides. ‘Protein MW and pI’ are the theoretical molecular weights and isoelectric points of the proteins; ‘Swissprot Accession no’ is an accession number in the SwissProt database that allows further information to be obtained about the identified protein; ‘protein name’ shows the name of the identified protein.