ABO blood group (transferase A, alpha 1-3-N-acetylgalactosaminyltransferase; transferase B, alpha 1-3-galactosyltransferase)
udpgal_g + fucgalacglcgalgluside_cho_g ⇌ h_g + udp_g + galfucgalacglcgalgluside_cho_g
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