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Cyanine 5.5 (Cy5.5; Figure 1) is a near infrared (IR) fluorescence-emitting dye that belongs to the Cyanine family of synthetic polymethine dyes.

Figure 1. Structure of 5'-Cyanine 5.5 (R = sequence).

metabion offers the Cy5.5 modification in its DNA and RNA portfolio:

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