background [0,0,0]
set ambient 40
set specular on
set specpower 8

select all
wireframe off

select protein
set hetero off
ribbons
color group

select nucleic
trace 10
color cpk
cpk 80
wireframe 40

select hetero & !water
cpk 80
wireframe 40
color cpk

select *.Fe?
cpk
color cpk

select Ca
cpk
color cpk

select *.Mg?
cpk
color cpk

select *.Zn?
cpk
color cpk

select *.Cu?
cpk
color cpk

select *.Ni?
cpk
color cpk

select *.S? & !protein
cpk
color cpk

center protein, nucleic
select *