Protein and Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merits rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function. Protein and Peptide Letters will focus on: Structure Studies, Recombinant Expression, Drug Design, Chemical Synthesis, Function, Pharmacology, Enzymology, Immunology, Biotechnology, Protein Engineering, Protein Folding, Sequencing, Molecular Recognition, Purification and Analysis.