...The probe, LUM015, developed by Lumicell in Wellesley, Massachusetts, consists of a fluorescing agent, Cy5-Lys, and a quenching molecule that inactivates the fluorescence. Only cathepsin proteases that are expressed by tumor cells can “switch on” the fluorescent probe by splitting the quenching molecule. The emitted fluorescence can then be visualized with a handheld camera.

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