ABO blood group (transferase A, alpha 1-3-N-acetylgalactosaminyltransferase; transferase B, alpha 1-3-galactosyltransferase)
2.0 udpgal_g + fucfucgalacglcgalacglcgal14acglcgalgluside_hs_g ⇌ 2.0 h_g + galgalfucfucgalacglcgalacglcgal14acglcgalgluside_hs_g + 2.0 udp_g