Phylogenetic tree of related sequences. Alignment was performed with DNASTAR-MegAlign (GCG Inc., Madison, WI). GenBank accession numbers for the amino acid sequences are: P-45598 and NP-461933, putative Ara transporters; NP-289515, a putative Gal transporter; O-52733 and NP-267659, putative Xyl transporters; NP-593320 and Q-10286, myo-inositol transporters; P-23586, CAA-04511, S-25015, and CAB-52689, hexose transporters; AF-416867, a putative rice (Oryza sativa) sugar transporter; T-14617, a putative sugar beet sugar transporter; AF-215837 and AF-480069, the celery mannitol transporters; NP-179209, NP-188513, and NP-195385, putative Arabidopsis sugar transporters; and T-14340, BAA-89458, and AF-167415, Suc transporters. Dotted lines indicate a negative branch length.