Fig. 6From: Human ACE2 protein is a molecular switch controlling the mode of SARS-CoV-2 transmissionThe model of hACE2-regulated SARS-CoV-2 transmission. The hACE2 protein is crucial in regulating the cell-free and cell-to-cell routes of SARS-CoV-2 transmission. When hACE2 levels are limited in cells, the balance tips toward cell-free transmission. Conversely, when hACE2 levels are abundant in cells, the balance tilts toward cell-to-cell transmissionBack to article page