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Macroscopic and microscopic appearance of PBAS and smears. (a) Macroscopic appearance of smears made from actual sputum (top), PBAS1 (middle), and PBAS2 (bottom). (b) Microscopic appearance of an actual sputum smear (top), PBAS1 (middle), and PBAS2 (bottom) with Ziehl-Neelsen staining (left) and auramine staining (right).
