[Chimera-users] stick representation after selection / DNA helical axis

[Damien Larivière]

Dear all,

I used the command sel @N1 @N3 to select the N1 and N3 atoms of a 
nucleic acid structure (like 1bna).

when I do "show only" in Actions / Atoms&Bonds, a specific 
representation is displayed as in the image below: sticks connect N1 
atoms of one strand and N3 atoms of the other strand.

May you tell me the meaning of this representation and how can I modify 
it (I mean, how to change the type of atoms to be connected)?

In fact, I would like to visually apprehend the helical axis. Is there a 
way to calculate and display this axis in Chimera?

Many thanks for your help

Damien


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