AM4-65isafixableredfluorescentnerveterminalprobe.ThedyeisspectrallyidenticaltoSynaptoRedC2(alsocalledFM4-64),butithasanadditionalaminegroupatthehydrophilicendofthemolecule,makingthedyefixablewithformaldehydeorgluteraldehyde.ThelongemissionwavelengthmakesthedyesuitabletobeusedwithGFPintwo-colorimaging.
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