UDP-GlcNAc:betaGal beta-1,3-N-acetylglucosaminyltransferase 3, Golgi apparatus
udpgal_g + acglc13galacglcgal14acglcgalgluside_cho_g ⇌ h_g + udp_g + galacglc13galacglcgal14acglcgalgluside_cho_g
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