load=1RIO

define set1{dna and *.O?}
define set2{dna and *.OP?}
define set3{dna and *.N?}

restrict none
select all
ribbons
color chain
pause 2

restrict none
select dna
wireframe
pause 2

restrict none
select set1
cpk 50
pause 2

restrict none
select set2
cpk 50
pause 2

restrict none
select set3
cpk 50
pause 2