Sulfo-Cy5-Mal (CAS No 2130955-10-9) is a synthetic dye used in biomedical research originating from the family of cyanine dyes renowned for their fluorescent properties It specifically targets thiol groups enabling its application in labeling proteins and peptides This compound operates through the maleimide group reacting efficiently in conjugation processes Sulfo-Cy5-Mal demonstrates activity in the nanomolar to low micromolar range and is commonly employed in vitro for imaging tracking and biosensor applications It is extensively used in various cell models and animal studies serving as a valuable tool in drug screening and molecular diagnostics Experimental concentrations typically depend on the specific research design Its integration into assays enhances sensitivity and specificity offering valuable insights into cellular processes and molecular interactions