title: Major Facilitator Superfamily (MFS) evolved without 3-transmembrane segment unit rearrangements.
authors.affiliation: Department of Molecular Biology, University of California, San Diego, La Jolla, CA 92093-0116.
authors.forename: Ake
authors.initials: A
authors.lastname: Västermark
authors.forename: Milton H
authors.initials: MH
authors.lastname: Saier
mesh_terms: D004926:Escherichia coli / Q000201:enzymology*; D029968:Escherichia coli Proteins / Q000235:genetics*; D019143:Evolution, Molecular; D027981:Symporters / Q000235:genetics*
chemical_list: D029968:Escherichia coli Proteins; D027981:Symporters