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. 2021 Nov 30;29(6):8109–8125. doi: 10.1007/s11356-021-17824-5

Fig. 4.

Fig. 4

Binding of SARS-CoV-2 with type II pneumocytes and macrophages, at ACE2 enzyme site using spike protein which is activated by TMPRSS2 or furin present on the cells. The ACE2 enzyme is released by ADAM17 a metallopeptidase which will be available for binding process