Synthetic neolactotetra glycoclusters inhibit attachment of neolactotetra-bearing Neisseria to immobilized Borrelia. Structures of glycoclusters bearing 3, 4, 6, 12, or 18 neolactotetra moieties synthesized on a carbosilane core (A). Attachment of Neisseria to Borrelia can be inhibited by glycoclusters bearing 12 or 18 but not 3, 4, or 6 neolactotetra moieties (B). Attachment of Neisseria to Borrelia is completely inhibited by Dumbbell (2)18 and N. meningitidis LOS mutant ΔlpxA (C). Standard deviations are shown. **, P <0.01.