METTL3 and infection: (a) Cumulative distribution function of log2 peak intensity of m6A-modified sites in T47D cells infected with retrovirus encoding sgMETTL3 resistant METTL3-WT, METTL3-Δ198, METTL3-Δ238, or control vector (Vec) followed by another infection with sgMETTL3 or sgControl (sgCtrl).