Among them, the expression levels of ACADVL, AUP1, COPB2, CS, DAP, GOT2, GRPEL1, HSPA9, HYOU1, LSS, MDH2, MYH7, P4HB, PDIA3, PDIA4, PLIN2, PRKAB2, PRKAG2, SCARB2, and SUCLG1 were upregulated, whereas ANXA2, ARHGDIB, CHMP4B, CORO1A, CTSS, FABP4, HSP90AA1, HSPB1, LAMTOR5, LDAH, MAN2B1, MYH9, MYL12B, MYL6, NPC2, PARK7, PSAP, RAB11B, RAB6B, RHOA, RPS27A, UBB, UBC, VIM, YWHAE, YWHAQ, and YWHAZ were downregulated in COVID-19 samples than those in non-COVID-19 controls (Figure 2B). Here, CTSS is linked to COVID-19.