The green fluorescence probe Col-F binds to collagen and elastin. This low-molecular weight fluorescent probe has been used sucessfully in imaging extracellular matrix in freshly excised animal tissues. Col-F also possesses cell permeant and nontoxic properties, and it will bind to activated cholinesterase enzymes. Optimal excitation on this fluorescein-labeled probe is 488 nm, optimal emission is 520-530nm. Col-F is supplied as lyophilized reagent for improved stability during storage and shipping. Each vial contains 0.5 mg.