BP Fluor 647 carboxylic acid is a bright green-fluorescent dye optimal for use with the 633, 650 nm Argon laser. The compound's sulfonate groups permit hydrophilicity and less aggregation in the aqueous solution. BP Fluor 647 is used for protein and antibody labeling, or nucleic acid applications with high labeling density. The carboxyl group can react with amines via coupling agent (e.g. HATU).
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