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Schematic representation of a mixed SAM in which an (EG)6 group terminating in a mannose ligand is presented above a background of (EG)3 groups. In this illustration, a SAM with χMan = 10−1 is shown. The triethylene glycol thiol extends 22 Å from the gold surface, whereas the extended mannose thiol, with three extra ethylene glycol units, extends 30 Å from the gold surface (18). The (EG)n groups prevent nonspecific adhesion of proteins or bacteria to the surface of the SAM (18).
