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Characterization of binding aptamers. Twenty-one aptamer candidates (SS-1 to SS-21) were analyzed by a post-SELEX method as described in Materials and Method. After incubation with S. sonnei cells, aptamers were retrieved. The eluents were amplified by RT-PCR and the average C(t) values were analyzed in triplicate individual experiments. *: C(t) value < 14.
