The Research Collaboratory for Structural Bioinformatics (RCSB) is a non-profit group "dedicated to improving our understanding of the function of biological systems through the study of the 3-D structure of biological macromolecules." The goal of RCSB is to provide free public resources and publications to further the fields of bioinformatics and biology. RCSB members include the Department of Chemistry and Chemical Biology at Rutgers University, the San Diego Supercomputer Center, and the Biotechnology Division of the National Institute of Standards and Technology. The Web site provides links to nine protein and nucleic acid databases, dozens of downloadable software packages for use in molecular structure determination and analysis, four online courses, and a community service link that includes Internet resources not maintained by the RCSB.