The NCBI Map Viewer (www.ncbi.nlm.nih.gov/mapview/) displays genome assemblies, genetic and physical markers and the results of annotation and other analyses using sets of aligned maps for 110 organisms. The available maps vary by organism and may include cytogenetic maps, physical maps and a variety of sequence-based maps. Maps from multiple organisms or multiple assemblies for the same organism can be displayed in a single view. Map Viewer also can display previous genome builds and can produce convenient formats for downloading data.
