Hi 

I am working with pdb id: 3cx5. This model is roughly C2 symmetric.

Is there a way to identify the symmetry (or rough symmetry of a not-so symmetric model) of a pdb/ mmcif model and orient the symmetry axis to the axis perpendicular to the screen?

On a similar note, say we select a 4 somewhat symmetry-related residues in this model and make 2 intersecting lines, is there a way to align these lines perpendicular to the perpendicular screen axis?

Thanks

Yaikhomba