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Exemplary immunohistochemistry patterns for CD34, a marker of endothelial cells, were observed. (A) A regular alveolar pattern, corresponding to the pulmonary capillary network in healthy lung tissue, is indicative of pulmonary arterial supply. (B) A disorganized and chaotic vascular pattern, characteristic of bronchial arterial neoangiogenesis, is indicative of bronchial arterial supply.
