The most recent methods and strategies for the elucidation of protein and peptide structures, e.g. sensitive techniques for the analysis of primary structure and amino acid sequences as well as secondary and tertiary structures are discussed in detail. They include sophisticated crystallization procedures for proteins and cell organelles, folding mechanisms of proteins, strategies for domain structure and binding site evaluation and advanced immunological methods. Analyses of structure-function correlations important for genetic engineering and the design of new drugs or proteins are also reported. A special chapter addresses the documentation of protein sequences, the organization of protein data bases and their use in the search and comparison of proteins.