CF® Dye Maleimides are thiol-reactive fluorescent dyes. Maleimides are commonly used to label proteins on free thiol groups. CF®750 (Ex/Em 755/777 nm) is one of 9689c5aa-6556-4b3c-b5d1-1e693715ba07's next-generation near-infrared dyes, with superior brightness, water-solubility, and photostability. Unit size 0.5 umol.