The exact location of the methylation varies .
The exact location of the methylation defines which clk epiallele we define the plant as having ; so far there are 7 identified clk epialleles ( numbered clk1 - clk7 ) .
The exact location of the methylation varies , but defines which clk epiallele we define the plant as having ; so far there are 7 identified clk epialleles ( numbered clk1 - clk7 ) .