Cyanine Dye 5 (Cy5) has a strong absorption peak at 643nm and a secondary absorption peak at 605nm. The maximum emission peak is at 667nm, with an excitation coefficient of 2.5 x105 cm-1M-1. Cy5 can be used as an alternative to AlexaFluor 647, and the phycobiliprotein Allophycocyanin.
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