O-antigen group O:38 polymerase yielding a very long O antigen chain length (100 repeat units)
100.0 udcdpgalnac_b1_3_glc_b1_2_glcnac_b1_4_gal_b1_4_gal_p ⇌ 99.0 udcpdp_p + OA38_VL_p