load =1mhd

define set1 *.O?' and dna
define set2 *.OP? and dna
define set3 *.N? and dna
color background white

cpk off
wireframe off
cartoon on
echo "1mhd entire structure"
pause


restrict dna
center selected
echo "DNA molecule"
pause

select set1
cpk 100
echo "Deoxyribose oxygen"
pause

select set1
cpk off
select set2
cpk 100
echo "Phosphate oxygen"
pause

select set2
cpk off
select set3
cpk 150
echo "Nucleobases nitrogen"
pause