Catalysis of the reaction: GDP-beta-L-fucose + beta-D-galactosyl-(1,4)-N-acetyl-D-glucosaminyl-R = GDP + 1,4-beta-D-galactosyl-(1,4)-[alpha-L-fucosyl-(1,3)]-N-acetyl-D-glucosaminyl-R. [EC:2.4.1.152, RHEA:14257]
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C5: Ontology GO: Gene Ontology GO:MF: GO Molecular Function