Protein Data Bank - PDB provides a text based format for archiving experimentally-determined, three dimensional structures, at the Brookhaven National Laboratory, with list of mirror sites worldwide. Structural Classification of Proteins - A key for different proteins based on structural features, with keyword search and PDB data, and an entry viewer for download. Atlas of Protein Side-Chain Interactions - Modeling the packing of all 20 amino acid side-chains with one-another and with DNA - from Birkbeck and University Colleges, London. Principles of Protein Structure - Archive of online course, with discussion lists, and summary of lecture notes from 1996 at Birkbeck, University of London, UK. Protein Structure Initiative - Large scale attempt to determine topology, through collaborative internet based effort, maintained by Millennium Information, Inc., Cambridge, MA. Histone Sequence Database - Compendium of histone protein sequence alignments, including postranslational modifications and proteins containing the histone fold, at the National Human Genome Research Institute, Bethesda, MD. Hydrogen Exchange Mass Spectrometry - Analysis of proteins and protein dynamics with hydrogen exchange and mass spectrometry from Corrales, NM. NetNglyc - N-glycosylation site prediction in human proteins using artificial neural networks that examine the sequence context of Asn-Xaa-Ser/Thr sequons, from Center for Biological Sequence Analysis, Technical University of Denmark. Peptide Peptidomimetic Informatics - Devoted to the modeling of polypeptide structures, aiming to bridge the gap from organic to biochemistry for undergraduates at the University of Pittsburgh, Bradford, PA. Chromatin Structure and Function - Information regarding histones, histone modifications and their biological roles, and related links. Tyrosine Residues in Different Proteins - EPR spectrum of a tyrosyl radical provides information about rotational angle of phenoxyl ring. Database compiled to identify the responsible locus, maintained at the University of Essex, Colchester, England. NetOGlyc 3.1 Server - Produces neural network predictions of mucin type GalNAc O-glycosylation sites in mammalian glycoproteins. Maintained at the Center for Biological Sequence Analysis, Technical University of Denmark. Chicken Egg White Lysozyme - Enzymatic activity, sequence, crystallization, 3D structure and links to publications on this enzyme. BlueTB Molecules - Mycobacterium tuberculosis database with information on DNA sequence, map position, structure, and function of proteins. Includes references to a scientific articles. NIGMS: The Structures of Life - Introduction to structural biology, its relationship to health, disease and developing new medications. Maintained by the National Institute of General Medical Sciences, Bethesda, Maryland. Kinase.com - A resource on protein kinases, a key class of regulatory proteins. Includes genomic and evolutionary analyses, classification, disease associations and an extensive database of protein kinase genes. Protein Kinase Resource - Functional and structural information, based on protein sequence, with link to nomenclature for the signaling cascade genes, maintained at the San Diego Supercomputer Center, CA, USA. Biozon - An attempt to classify all proteins to create a unified biological knowledge resource with emphasis on protein and DNA characterization and classification. Protein Structure Prediction Center - Advances and archive of meetings on critical assessment of 3D determination from sequence using alignment tools. Maintained at Lawrence Livermore National Laboratory, California. Databases - Several protein databases including TIMBAL, HOMSTRAD, CREDO, ESST and BIPA including references, maintained by the Department of Biochemistry, University of Cambridge, UK.