IL4 and COVID-19: Interestingly, a series of COVID-19 related pathways were significantly enriched by RNAenrich (shown in Fig. 2 and Table 4), e.g. human interleukin-4 and interleukin-13 signaling (P = 5.74E-14) (P refers to P.adjust), interleukin-6 signaling (P = 8.64E-04), and so on (shown in Table 4 and Supplementary Tables S1 and S2).