load=1rh6
define set1 (*.O?' and dna)
define set2 (*.OP? and dna)
define set3 (*.N? and dna)
select all
wireframe 0.15; spacefill 23% ; color cpk
pause

select all
cpk off
wireframe off
select dna
centre selected
wireframe 
pause

select all
cpk off
select set1
wireframe 0.15; spacefill 23% ; color cpk
pause

select set1
cpk off
select set2
wireframe 0.15; spacefill 23% ; color cpk
pause

select set2
cpk off
select set3
wireframe 0.15; spacefill 23% ; color cpk
pause