Modified Haworth projection of the predominant structure of H. somnus strain 738 LOS (9). All outer core hexoses are beta-D oriented and both inner core l-glycero-d-manno heptoses are l-α-d oriented. Abbreviations: Gal, galactose; GlcNAc, N-acetyl-glucosamine; Glc, glucose; Hep, heptose; Kdo, 3-deoxy-d-manno-2-octulosonic acid.