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Dye structures. FM1-84, FM1-43, SynaptoGreen C3, and FM2-10 share identical fluorophore cores. All of the FM dyes have two lipophilic “tails”; in FM1-84, the lipophilic tails are composed of four methylene groups and a terminal methyl group. FM1-43, SynaptoGreen C3, and FM 2-10 have hydrocarbon tails composed of four, three, and two carbons, respectively. FM4-64 and FM5-95 have the same two-carbon tails, but have distinct charged “head” regions.
