Expressions

• Individual and Groups of Atoms

  select atomnu=0	first atom (atom numbering begins with 0)
  select atomnu>4	atoms number 5 and greater
  select *	all atoms
  select *.o	all oxygen atoms
  select ser	all atoms in all serines
  select *80	all atoms in residue 80
  select elemnu=6	all carbon atoms
  select elemnu<>8	all atoms except oxygen atoms

• Compound expressions

  select (atomnu=3) or (atomnu=6)	atoms numbered 3 and 6
  select (atomnu>=3) and (atomnu<=6)	atoms numbered 3, 4, 5 and 6