bookmark TransportDB Provides annotations for predicted transporters across sequenced genomes. TransportDB serves the membrane transporter annotation of 2777 complete genomes, comprising 2557 eubacteria, 164 archaea and 56 eukaryota. The database currently contains 860252 individual transporters, classified into 168 distinct families of transporters. In terms of each class of transporter, the database currently includes 457183 ATP-Dependent transport proteins, 32952 phosphotransferase system, 318233 secondary transporters, 29874 ion channels, 3273 outer membrane porins and 18731 unclassified transporter proteins. TransportDB also incorporates analysis tools that enable users to query the database on a number of levels.