> I'm new with Pymol and I would like your help in the following problem:
> I have a receptor image that I want to emphasize the ligand in its interior.

I'm a big fan of transparent surfaces for this, e.g.:
http://bioinfo.mbb.yale.edu/people/nat/mbp.mpg

> Its a nonpeptidic ligand that I would like to increase the radius of the
> sticks model.

set stick_radius = 0.3
or something like that - I think the default is 0.25 or something like
that.

> I also would like to draw a plane connecting 4 atoms in one specific region
> of the ligand.

Use a CGO:
http://pymol.sourceforge.net/html/S0500cgo.html
What you'd really need is probably a triangle strip - the two triangles
being the two haves of the quadrilateral object with the 4 atoms as
vertices.

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Nathaniel Echols                                                  Programmer
n...@bioinfo.mbb.yale.edu                                        Gerstein Lab
203-589-6765                                                 Yale University
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