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Effects of ascorbic acid (800 µM) on ACE2 cellular expression on human SAEC in the presence of various concentrations of natural compounds: (A) zinc aspartate, (B) epigallocatechin gallate (EGCG), (C) 10-undecenoic acid (UCA), (D) N-acetylcysteine (NAC), (E) baicalein, and (F) theaflavins.
