[PyMOL] Show sticks till a certain radius

[Horacio Emilio Pérez Sánchez]

Hi,

Given a receptor in cartoon representation and a ligand (sticks) in its 
cavity, center of mass x, y, z, I wonder how could I get the sticks 
representation of the protein (in addition to cartoon) but only in a 
region limited by a sphere of radius "R", with center at x, y, z.

Thanks in advance

Horacio