echo "What's the difference between a/b and a+b?"
echo ""
echo "Ribonuclease T1 is an a+b protein. The helix starts"
echo "the sequence followed by the beta strands."
echo ""
load 9RNT.pdb
wireframe off
cartoon
select alpha
colour red
select sheet
colour blue
pause
zap
echo "TIM is an a/b protein. Notice how the helicies (red)"
echo "and strands (blue) follow one another in sequence."
echo ""
load 1HTI.pdb
wireframe off
rotate x 2
rotate y -30
rotate z 58
select 1-248A
cartoon
colour white
select alpha
colour red
select sheet
colour blue
pause
zap