generate dimer from a monomer

fetch 4ryl
symexp 4ryl, 4ryl, 4ryl, 3

1. protein structure - Generate full dimer from monomer with C2 symmetry? - Biology Stack Exchange
2. How can I generate a dimer from a given conformation of a monomer, without any information from a crystal structure? | Schrödinger (schrodinger.com)

select

select resn ARG and name NH1 or name NH2
select resn GLU and name OE1 or name OE2
dist 1, ARG_N, GLU_O, 5, mode=2

1. Selection Algebra - PyMOLWiki
2. Distance - PyMOLWiki

for-loop

PyMOL>for i in [1,2,3]: cmd.group("%s-com"%(i), "%s*"%(i))