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DAD phase 2 in COVID-19 patiens. (A–C)—vascular proliferation in lungs. (А)—H&E, ×40, (B,C)—IHC with the CD31 marker, B×20, (C)—×40. (D–F)—squamous cell metaplasia of an alveolar epithelium and bronchi. D—H&E, ×20, (E,F)—IHC staining with the CK5-6 marker, (E)—×20, (F)—×40.
