Fig. 6. KVX-053 treatment attenuates the expression of PTP4A3 phosphatase in mice after exposure of SARS-CoV-2 Spike protein Subunit 1. Immunohistochemical staining of lung sections with PTP4A3 antibody. Green arrows indicate the overexpression of PTP4A3. Original magnification 10× and 60x; Black scale bar = 50 μm, red scale bar = 10 μm.