CHROMINFO is a prototype database that is intended to serve as a liaison tool for researchers working in different centers on mapping of the same mammalian chromosome. It provides a bird's-eye-view of top-level entities on a chromosome (such as gene loci, chromosome breakpoints and contigs) and relates them to one another in one dimension, the axis of the chromosome. Consensus data can be entered, edited, queried and displayed in a variety of ways. Summary evidence for consensus data can also be stored and retrieved. Information may be downloaded from the Genome Data Base periodically, and order and distance information is then incorporated. The prototype of CHROMINFO was built for human chromosome 16. Versions have been created for several other chromosomes.