In addition, there are other potential SARS–CoV-2 receptors, such as BSG (CD147) and NRP1(enriched in trophoblast) receptors (expressed in the pre-gastrulation embryo), and proteases, such as CTLS (Cathepsine L-like cysteine protease), a key protease in embryos, suggesting there are other routes for infection of embryos that need further investigation [84–87]. The gene discussed is BSG; the disease is infection.