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. 2004 Aug 30;166(5):709–715. doi: 10.1083/jcb.200406148

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Copyright © 2004, The Rockefeller University Press

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Figure 3. — Central pair orientation in quiescent spoke-defective flagella. Each pair of images includes one undistorted image (A–C) and one image distorted to emphasize CP orientation (A'–C'). (A and A') A pf17 flagellum in which the CP has two twists (arrows). (B and B') A pf1sup-pf1 flagellum with one twist (arrow). (C and C') A curved pf1sup-pf1 flagellum with one twist (arrow) between bends of opposite curvature. CP microtubules are parallel to the substrate in curved regions. Bars, 1 μm.