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Examples of annotations: (A) Ziehl–Neelsen staining tissues, which do not contain acid-fast bacilli (AFB), for the purpose of training the background other than AFB. No annotation was performed; (B) We annotated short-rod-shaped bacilli that were stained red in Ziehl–Neelsen staining as AFB; (C) Nuclei of type I epithelial cells showing AFB-like morphology, annotated as artifact 1; (D) Part of the fibrin-stained purple, annotated as artifact 2.
