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. 2016 Mar 25;8(1):1–6. doi: 10.1038/ijos.2016.3

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The potential mutagenic molecule. Janus nucleoside analogues (for example, J-GC) can pair with guanosine and cytidine by rotating around the glycosyl bond. J-GC, Janus-type pyrimido[4,5-d]pyrimidine guanosine–cytosine.