Cyanine Dye 3 (Cy3) has a strong absorption peak at 550nm and a secondary absorption peak at 520nm. The maximum emission peak is at 570nm, with an excitation coefficient of 1.5 x10&superscript_begin;5&superscript_end; cm&superscript_begin;-1&superscript_end;M&superscript_begin;-1&superscript_end;. Cy3 can be used as an alternative to Alexa Fluor 555, DY-550, Rhodamine Red-X and TAMRA [5(6)-Carboxytetramethylrhodamine].
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