O-antigen group O:42 polymerase yielding a very long O antigen chain length (100 repeat units)
100.0 udcdpglcnac_a1_3_gal_a1_2_rmn_a1_2_rmn_b1_2_mannac_p ⇌ 99.0 udcpdp_p + OA42_VL_p