resource maintained by the Ludwig Institute for Cancer Research, Academy of Cancer Immunology and European Cancer Immunome Program. [requires free registration]

Two-dimensional polyacrylamide gel electrophoresis database, including manual for mapping proteomes of different phyla.

HPRD offers a centralized platform to visualize domain architecture, post-translational modifications, interaction networks and disease association for each protein in the human proteome. Includes map of pathways and FAQ maintained by Johns Hopkins University and the Institute of Bioinformatics.

OPD is a public database for storing and disseminating data based on mass spectra, representing experiments on human, yeast, E. coli and Mycobacterium organisms. Includes related links maintained at the University of Texas.

Resource for human plasma proteins along with their isoforms, specific expression, disease, localization, post translational modification and SNP. Includes FAQ, query interface, or browsing by structure or function.

Protein phosphorylation database which attempts to provide a global unifying resource for post-translational modification. Includes phosphoproteomic dataset repository maintained at the Sanger Institute, England.