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Schematic representation of the RND superfamily. APPE = Aryl Polyene Pigment Exporter; EST = Eukaryotic (putative) Sterol transporter; HAE1 = Hydrophobe/Amphiphile Efflux-1; HAE2 = Hydrophobe/Amphiphile Efflux-2; HAE3 = Hydrophobe/Amphiphile Efflux-3; HME = Heavy-Metal Efflux; NFE = putative Nodulation Factor Exporter; SecDF = Secretion system DF family.
