background [230,240,250]
echo
echo chain_1, chain_2 MUST be defined!
echo region_1, region_2 MUST be defined!
echo
restrict none
select chain_1, chain_2
backbone 30
select chain_1
color purple
select chain_2
color green
echo
echo Superposed chains of TWO porins are shown
echo Press any key
pause
select chain_1, chain_2
backbone
select (region_1 and chain_1), (region_2 and chain_2)
backbone 100
echo
echo Regions of interest are distinguished
echo Press any key
pause
select within(2., *.ca and chain_1 and region_1) and *.ca and chain_2 and region_2
cpk 200
select within(2., *.ca and chain_2 and region_2) and *.ca and chain_1 and region_1
cpk 200
echo
echo C_alpha atoms close to each other are shown 
echo
echo Verify sequence alignment, please!
echo Good luck!
echo