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Figure 1. Micrographs of bacteria immobilized on a tipless cantilever and a poly-L-lysine-coated glass surface, together with a schematic presentation of the force-distance curves recorded by AFM. (a) Scanning electron micrograph of the tipless cantilever with immobilized actinomyces (upper panel) and light micrograph of a glass surface with an immobilized streptococcal partner (lower panel). The bars used are 5 µm. (b)finally broken and interaction is no longer detected.