In cell-free infection, hACE2-A549 cells with red fluorescent protein (RFP, hACE2-RFP-A549) were readily infected by SARS-CoV-2 in the presence of control antibody, as revealed by an IFA with NSP3 (Fig. 1b, Ctrl Ab) and as quantified using high-content image analysis (Fig. 1d). The gene discussed is SH2D3C; the disease is infection.