load ==1BDT.pdb
background white
select all
color cpk 
wireframe 40
cartoons off
cpk off

pause

restrict dna
wireframe 40
cpk off
define set1 *.o4*
define set2 *.OP?
define set3 *.N? and dna

pause

select set1
cpk 250
color green

pause

select set1
color cpk
cpk off
select set2
cpk 200
color red

pause

select set2
color cpk
cpk off
select set3
cpk 200
color blue