O-antigen group O:57 polymerase yielding a very long O antigen chain length (100 repeat units)
100.0 udcdpgalnac_a1_3_glc_a1_4_rmn_a1_2_rmn_b1_2_glcnac_p ⇌ 99.0 udcpdp_p + OA57_VL_p