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DNA aptamer sequences were selected and screened for affinity against recombinant human insulin-like growth factor-I (rhIGF-I) using an ELISA-like aptamer-based assay (ELASA). When the top four aptamers were paired against one another in all possible sandwich assay combinations using capture aptamers on magnetic beads (MBs), one sandwich combination appeared superior. This combination produced a reliably...
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