load ==1H9T.pdb
select all
color cpk 
wireframe 50
cartoons off
cpk off

pause

restrict dna
wireframe 50
cpk off
define set1 *.o4*
define set2 *.OP?
define set3 *.N? and dna

pause

select set1
cpk 200
color purple

pause

select set1
color cpk
cpk off
select set2
cpk 200
color pink

pause

select set2
color cpk
cpk off
select set3
cpk 200
color cyan