The ruminant parasite Haemonchus contortus expresses an alpha1,3-fucosyltransferase capable of synthesizing the Lewis x and sialyl Lewis x antigens.
DeBose-Boyd, Nyame, Jasmer, and Cummings. 1998. “The Ruminant Parasite Haemonchus Contortus Expresses an Alpha1,3-Fucosyltransferase Capable of Synthesizing the Lewis X and Sialyl Lewis X Antigens.”. Glycoconj J 15 (8): 789-98.