Viral or cellular RNAs were extracted using the Purelink RNA Mini Kit (Thermo Fisher Scientific, 12183025) according to the manufacturer’s instructions. DNase I (NEB, M0303L) treatment was adopted to remove DNA contamination following by phenol-chloroform isolation and ethanol precipitation treatment to remove enzyme contamination. SARS-CoV-2 genomic RNA was quantified by one step PrimeScriptTM RT-qPCR Kit (Takara, RR064A). The expression level of m6A enzymes were quantified using a one-step SYBR Green® PrimeScript™ PLUS RT-PCR Kit (Takara, RR096A). Primers, probes and oligonucleotides were listed in Supplementary information, Table S1.
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