Fig. 3

The influence of the SARS-CoV-2 S protein exposure on the development of hEROs. A Schematic of S protein treatment of hEROs at different points. B The relative mRNA levels of ACE2 and TMP in hEROs at day 90 after S protein exposure, compared to control groups . C The relative mRNA levels of ACE2 and TMP in hEROs at day 280 after S protein exposure, compared to control groups . D Representative images of the expression of RECV+/ACE2+ cells and CRX+/ACE2+ cells in hEROs at days 90 and 280 after S protein exposure. E The ratio of CRX-positive cells/ area (μm2) and the average fluorescence intensity of RECV- positive cells in 90-day hEROs after S protein exposure, compared to control groups . F The ratio of CRX-positive cells/ area (μm2) and the average fluorescence intensity of RECV- positive cells in 280-day hEROs after S protein exposure, compared to control groups. Data are presented as means ± SD. Scale bar, 50 μm