Figure 1.

Figure 1.

Cross section of the cilia

A. Schematic diagram of a cilium revealing "9+2" arrangement of nine peripheral microtubule doublets surrounding a central microtubule pair

B. Representative electron microscopic image of a normal cilium from the nasal epithelium of a control. "O" represents the outer dynein arm (open arrow) and "I" represents the inner dynein arm (solid arrow). The central pair and radial spokes are also visible.

C. Representative electron microscopic image of a cilium from the nasal epithelium of an individual with PCD demonstrating absence of dynein arms

From: Primary Ciliary Dyskinesia

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