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ALT A diagram of the eukaryotic axoneme in cross section. It is presented as viewed from base toward the tip of a flagellum. Prominent structures are labeled including the inner dynein arm (IDA), outer dynein arms (ODAs) and the nexin–dynein regulatory complex (N-DRC). The standard numbering system for the outer microtubule doublets and doublet subtubules (A DMT and B DMT) are indicated. Red triangle indicates the microtubule seam. Central pair (CP) projections and the inner junction (IJ) are shown. Note that doublets #5 and 6 are shown permanently linked (5–6 bridge) to each other and radial spokes (RS) 3 and 8 are linked to the CP apparatus. These connections occur in flagella and cilia of metazoa. The axis from doublet #1 to the center of doublets #5–6 defines the primary beat plane for most cilia and flagella.





























