SoyBase, the USDA-ARS soybean genetics database, is a central repository where researchers can quickly find information on most aspects of soybean genetics, metabolism, and pathology. In 1993 SoyBase offered the first publicly available RFLP maps of the soybean genome as well as the first extensive collection of metabolic data in a plant genome database. SoyBase has since been expanded to contain almost all published data on soybean genetic research. A major milestone occurred in 2000 when a set of composite genetic maps was released. The current composite genetic maps contain more than 3800 mapped classical and molecular loci along with more than 950 QTL.