Phylogenetic tree showing the relationships of the AtFUT proteins with each other and with fucosyltransferases from other organisms. The tree was generated using CLUSTAL W for alignment, a BLOSOM 45 matrix, gap opening penalty of 13, and gap extension penalty of 0.05. AtFUT1 and PsFUT1 are α-1,2-fucosyltransferases. FUT1 and FUT2 encode α-1,2-fucosyltransferases, NodZ and FUT8 encode α-1,6-fucosyltransferases, and FucT C3 is the enzyme that adds Fuc to the core structure of N-linked glycoproteins in the mung bean (Vigna radiata) plant. FUT3-7 encode α-1,3/1,4-fucosyltransferases that are responsible for many blood group antigens in humans. GenBank protein ID numbers (not in Fig. 2) are: g19526, human FUT1; g12643984, pig FUT1; g1730125, human FUT2; g1730131, rat FUT2; g4758408, human FUT8; g5702039, vigna FucT C3; g4503811, human FUT4; g4503809, human FUT3; g4503815, human FUT6; g1730137, human FUT7; and g7453579, PsFUT1.