Protein, Sequence, or Reference Search:Protein Searches retrieve lists of proteins and their modification types based on protein name or ID, protein type, domain, cellular component, MW, and pI range. Sequence searches retrieve lists of proteins and sequences containing specified sequences, degenerate motifs, and domains. Reference searches by author or protein retrieve lists of associated literature references. PubMedID searches returns information about the sites curated from the selected paper.

Site Search:Retrieve lists of modification sites that fulfill the selected search parameter(s). Data output includes the modified residue and flanking sequences, protein and gene names, and related information.

Comparative Site Search:Retrieves a list of modified sites that possess certain specified attributes and exclude others. Searches can be restricted by eight criteria: sites responsive to specific treatments, or those observed in specific protein types, domains, cellular components, disease states, cell lines, cell types, or tissues.

Browse MS2 Data by Disease:Allows the user to browse curated MS/MS records by selecting a disease type. Results show the number of records and associated modification sites observed in the selected disease.

Browse MS2 Data by Cell Line:Allows the user to browse curated MS/MS records by selecting a cell line. Results show the number of records and associated modification sites observed in the selected cell line.

Browse MS2 Data by Tissue:Allows the user to browse curated MS/MS records by selecting a tissue. Results show the number of records and associated modification sites observed in the selected tissue.