The SLC tables - originally prepared by the authors of the SLC mini-review series of Pflügers Archives - give the latest updates of the SLC families and their members as well as relevant links to gene databases and reviews in the literature. The Human Genome Organization (HUGO) Nomenclature Committee Database includes more than 40 transporter families of the so-called SLC (solute carrier) gene series. The SLC families represent a major portion of the transporter-related genes and additional SLC transporters are constantly being identified. The remaining transporter-related genes include those encoding ATP-driven transporters, channels, ionotropic receptors, aquaporins, transporter and channels subunits, auxiliary/regulatory transport proteins, etc. (see Figure to the right).