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Model of A. thaliana microtubule protofilaments with denoted positions of β-tubulin epitopes. Amino acids exposed on surface of protofilaments are colored for epitopes recognized by monoclonal antibodies 18D6, TU-06, TU-12, TUB 2.1 and TU-14. Outer and inner sides of adjacent protofilaments are depicted. α and β denote positions of tubulin subunits in protofilaments; (+) and (-) mark the orientation of protofilaments.
