The sperm flagella of the blowfly Sarcophaga bullata demonstrate the relationship of radial projections in the matrix region to the microtubule organization of the axoneme. The A microtubule of each peripheral doublet is connected to the central sheath by a series of paired radial links. The links lie along the tubule wall with a alternate spacing of about 320/560 A. The distal end of each link is enlarged into a globular head that connects via a transitional link to the helical sheath around the central microtubules. The radial link pairs are disposed in the form of a double helix with a pitch of about 1760 A. It is proposed that a similar organization is common to all cilia and flagella showing ninefold symmetry and must provide, in part, the morphological basis for motility.
NEW OBSERVATIONS ON FLAGELLAR FINE STRUCTURE : The Relationship Between Matrix Structure and the Microtubule Component of the Axoneme
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Fred D. Warner; NEW OBSERVATIONS ON FLAGELLAR FINE STRUCTURE : The Relationship Between Matrix Structure and the Microtubule Component of the Axoneme . J Cell Biol 1 October 1970; 47 (1): 159–182. doi: https://doi.org/10.1083/jcb.47.1.159
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