ABO blood group (transferase A, alpha 1-3-N-acetylgalactosaminyltransferase; transferase B, alpha 1-3-galactosyltransferase)
udpacgal_g + fucgalacgalfucgalacglcgal14acglcgalgluside_cho_g ⇌ h_g + udp_g + acgalfucgalacgalfucgalacglcgal14acglcgalgluside_cho_g