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Relative position of secondary bronchi along the primary bronchus. (A) Distance of each bud (b1, b2, b3, b4) normalized to the length of the primary bronchus (L), as measured from the tracheal bifurcation (T). (B) Average number of epithelial cells along the primary bronchus between subsequent secondary bronchi. Data +/− SEM (n>10), * p<0.05, ** p<0.001 relative to controls.
