ACE2	angiotensin-converting enzyme 2
COVID-19	coronavirus disease 2019
CSS	COVID-19 severity score
ED	emergency department
HSAE	human small airway epithelial
LAP	latency-associated protein
MEK	MAP/ERK kinase
MEKi	MEK inhibitor
RBD	receptor-binding domain
SARS-CoV-2	severe acute respiratory syndrome coronavirus 2
TGF-β	transforming growth factor beta
TU	transduction units