OR4C5 and COVID-19: The analysis identified genes harboring deleterious mutations (according to the DANN score) with a statistically significant higher frequency in controls than in COVID-19 patients such as the olfactory receptor gene OR4C5 (adjusted p-value of 1.5E-10), (Fig 2 and S1 Table) and NDUFAF7, although to a lesser extent (Fig 2 and S1 Table).