6-O-Methyl Guanosine is a modified nucleoside[1]. 6-O-Methyl Guanosine (6-methylguanosine) inhibit colony-forming ability in a malignant xeroderma pigmentosum cell line[2].
[1]. Grasby JA, et al. The synthesis of oligoribonucleotides containing O6-methylguanosine: the role of conserved guanosine residues in hammerhead ribozyme cleavage. Nucleic Acids Res. 1993 Sep 25;21(19):4444-50.
[2]. Thielmann HW, et al. 6-Methylguanine and 6-methylguanosine inhibit colony-forming ability in a malignant xeroderma pigmentosum cell line but not in other xeroderma pigmentosum and normal human fibroblast strains after treatment with 1-(2-chloroethyl)-1-nitroso-3-(2-hydroxyethyl)-urea. J Cancer Res Clin Oncol. 1987;113(1):67-72.