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Chemical structures of Alexa fluorophores, QSY quenchers and modified nucleotides. The chemical structure of Alexa647 was adopted from Terpetschnig, E. A.; Patsenker, L. D.; Tatarets, A. US Patent Application No. 20040166515, August 26, 2004. The structure of amino-modifier C6 dC is not shown for brevity, as it is essentially the same as amino-modified dT, except for the nucleobase component.
