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  1. ;Helix Fragment
  2. ; Stick colour
  3. 2(0.700000, 0.700000, 0.700000)
  4. ; Model
  5. BS
  6. ; Definitions
  7. C = 1.155, 0.600(0.500000, 0.500000, 0.500000)
  8. H = 0.675, 0.363(1.000000, 1.000000, 1.000000)
  9. O = 1.078, 0.560(1.000000, 0.000000, 0.000000)
  10. N = 1.025, 0.532(0.000000, 0.000000, 1.000000)
  11. D = 1.000, 0.519(0.000000, 1.000000, 0.000000)
  12. ; Instances            
  13. N1:    -1.4035    1.6997    -1.1733
  14. C2:    -0.5124    1.8519    -0.0437
  15. C3:    0.2569    0.5781    0.2128
  16. O4:    1.4614    0.5873    0.3155
  17. D5:    -1.1077    2.1006    0.864
  18. H6:    0.2247    2.6593    -0.2621
  19. N7:    -0.4502    -0.5645    -0.0524
  20. C8:    0.2117    -1.8398    0.1171
  21. C9:    1.425    -1.9426    -0.7759
  22. H10:    -1.4614    -0.53    0.0719
  23. D11:    -0.496    -2.6593    -0.1432
  24. H12:    0.5542    -1.9397    1.1733
  25. ; bonds
  26. N1,C2            
  27. C2,C3            
  28. C2,D5            
  29. C2,H6
  30. C3,O4
  31. C3,N7
  32. N7,C8
  33. N7,H10
  34. C8,C9
  35. C8,D11
  36. C8,H12
  37. ••Helix Conformation
  38. ••Carbon-2 of each amino acid residue can rotate with respect to its neighbors in the chain. This particular conformation, if repeated, gives a helix.