Consistent with reported methylarginines in iPTM/PhosphoSitePlus, our analysis of 1H-13C-HSQC and HCC(CO)NH spectra revealed that arginine residues 94, 101, 105, 112 and 116 are methylated in non-phosphorylated CIRBP-RGG (Supplementary Figure S2). The gene discussed is CIRBP; the disease is hepatocellular carcinoma.