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The interior of the CmeC channel. (a) Extracellular view of the CmeC trimer. The three R104 residues of the trimer are found to interact and block the channel. (b) Periplasmic view of the CmeC trimer. The charged and polar residues Q412, D413, E416, and N420 are found to interact with each other and block this end of the channel.
