Figure 1.

Numbers of different species represented in MMDB and numbers of known structures, for selected taxa from the ‘tree of life’. The hierarchy of taxa is taken from the NCBI taxonomy database, with each box corresponding to a particular node in the hierarchy, as indicated by its scientific or common name. Also shown is the number of individual species within each taxon from which one or more 3D structures are known, followed by the number of structures in MMDB derived from these species. Figure 1 and Table 1 are based on structures available in MMDB as of July 2001. The total number of structures for ‘all species’ omits structures for which no taxonomy link is assigned, for example short oligonucleotides.