= Basal body
A <basal body> is the <centriole>-derived structure at the base of a <cilium> or a eukaryotic <flagellum>. It anchors and organizes the <microtubules> of the projecting structure. A typical <basal body> contains nine peripheral <microtubule> triplets; farther along the <cilium>, the corresponding outer elements usually continue as doublets. The central pair found in many motile <cilia> is not a pair of central <microtubules> running through the <basal body>.<Molecular Biology of the Cell, 4th edition by Bruce Alberts and others>[Chapter 16, Cilia and Flagella: basal-body triplets and axonemal doublets]{ref}
In a cell bearing a primary <cilium>, a mature <centriole> can dock at the <cell membrane> and act as its <basal body>. The same underlying <organelle> therefore has different roles depending on its position and associated structures: a <centriole> within a <centrosome> helps organize an intracellular <microtubule> system, whereas a <basal body> organizes a projection from the surface. The ninefold arrangement is connected to assembly of <SAS-6> into a central cartwheel scaffold.<Structural basis of the 9-fold symmetry of centrioles by Daiju Kitagawa and others>[Summary and structural model, Figures 5–6]{ref}
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