Hi all,<br><br>I am refining a structue  of protein-DNA complex with coot. I add DNA by &quot;adding ideal DNA/RNA&quot; in the other model. But I cannot edit chi angle of these nucletide, neither the mutate.  When I press the mutate  and my DNA, coot give amino acid not nucletide. Why?<br>
<br>Thanks<br><br>Lisa<br>