Scheme showing the structure of cytosine, 5-methylcytosine, and 5-hydroxymethylcytosine. Adding a methyl group to the DNA base cytosine represses gene expression in mammalian cells. To remove the ...
Under physiological conditions, most double-stranded nucleic acids adopt right-handed helical conformations such as B-DNA or A-RNA. However, under specific cellular stresses, nucleic acids can ...
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