beta-D-galactosyl-(1->4)-N-acetyl-D-glucosamine + GDP-beta-L-fucose => beta-D-galactosyl-(1->4)-[alpha-L-fucosyl-(1->3)]-N-acetyl-D-glucosamine + GDP + H(+)
beta-d-galactosyl-(1->4)-n-acetyl-d-glucosamine + gdp-beta-l-fucose => beta-d-galactosyl-(1->4)-[alpha-l-fucosyl-(1->3)]-n-acetyl-d-glucosamine + gdp + h(+)
beta-D-galactosyl-(1->4)-N-acetyl-D-glucosamine + GDP-beta-L-fucose => beta-D-galactosyl-(1->4)-[alpha-L-fucosyl-(1->3)]-N-acetyl-D-glucosamine + GDP + H(+)
beta-d-galactosyl-(1->4)-n-acetyl-d-glucosamine + gdp-beta-l-fucose => beta-d-galactosyl-(1->4)-[alpha-l-fucosyl-(1->3)]-n-acetyl-d-glucosamine + gdp + h(+)