This methylation brings about the Clark Kent ( clk ) epialleles , which are a set of altered versions of the Superman gene lacking function .
Specifically , cytosine methylation ( attachment of methyl radicals to cytosine bases ) , which represses its transcriptional activity .
This methylation brings about the Clark Kent ( clk ) epialleles , which are a set of altered versions of the Superman gene lacking function .
Specifically , cytosine methylation ( attachment of methyl radicals to cytosine bases ) , which represses its transcriptional activity .