load=1gtr
define set1 {*.O?' and dna}
define set2 {*.OP? and dna}
define set3 {nitrogen and dna}
select all
cartoons off
cpk off
wireframe off
cpk 30%
wireframe 40
color cpk
pause
select all
cartoons off
cpk off
wireframe off
select dna
wireframe 40
pause
select set1
cpk 40%
pause
select set1
cpk off
select set2
cpk 40%
pause
select set2
cpk off
select set3
cpk 40%