The CY dye series represents a family of superior cyanine-based fluorescent markers widely employed in modern bioimaging and molecular detection. Characterized by their extended conjugation systems, these dyes exhibit enhanced molar extinction coefficients (>200,000 M⁻¹cm⁻¹) and high quantum yields across the visible to near-infrared spectrum (550-850nm).

Key advantages include:
 

• • Bright NIR performance for deep-tissue imaging
• • Excellent protein conjugability via NHS ester or maleimide chemistry
• • Outstanding photostability compared to conventional fluorophores