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Electron micrograph of cross-sections of respiratory cilia. (Left) Normal ciliary ultrastructure. (Right) Two cross-sections of respiratory cilia from patient D50X1 showing a heterogeneous ultrastructure: whereas some cilia appear normal (Left), others (66%) display outer dynein arm defects (Right). The black arrow indicates a normal outer dynein arm, and white arrowheads indicate shorter or missing outer dynein arms. (Scale bars: 100 nm.)
