import chimera as ch
opened = ch.openModels.open("http://posa.sanfordburnham.org/POSAn/result/13960411172041/Calmodulin/d1ncxa_A-tran.pdb")[0]
mod = opened
mod.display = True
residues = mod.residues
from chimera import runCommand 
runCommand("background solid white")
opened = ch.openModels.open("http://posa.sanfordburnham.org/POSAn/result/13960411172041/Calmodulin/d2sasa_A-tran.pdb")[0]
mod = opened
mod.display = True
residues = mod.residues
from chimera import runCommand 
runCommand("background solid white")
opened = ch.openModels.open("http://posa.sanfordburnham.org/POSAn/result/13960411172041/Calmodulin/d1jfja_A-tran.pdb")[0]
mod = opened
mod.display = True
residues = mod.residues
from chimera import runCommand 
runCommand("background solid white")