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Fig. 7. (A) A slice of the lung of the ostrich Struthio camelus at the level of the third costal sulcus showing stacks of anastomosing parabronchi (p), a mediodorsal secondary bronchus (b) and a pulmonary artery (a). Each gradation on the scale bar, 1 cm. (B) A slice of the lung at the level of the first costal sulcus showing parabronchi (p), a medioventral secondary bronchus (b) and a pulmonary artery (a). The circle shows a secondary bronchus. Each gradation on the scale bar, 1 cm.
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