1J8L:
reference: Crystallographic studies on damaged DNAs IV. N( 4)-methoxycytosine shows a second face for Watson-Crick base-pairing, leading to purine transition mutagenesis., Hossain MT, Sunami T, Tsunoda M, Hikima T, Chatake T, Ueno Y, Matsuda A, Takenaka A, Nucleic Acids Res 2001 Oct 1;29(19):3949-54. PMID: 11574676

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