SELECT N(<Atom name>)
This statement allows a number of atom names to be read. When the subject is being matched to the target, only atoms whose names are on a SELECT statement will be used. Each residue considered must contain all the atoms mentioned on the SELECT statement. This statement is required for the OVERLAY command.
Each SELECT statement adds its atoms to the complete list. Once atoms have been selected they cannot be unselected.
The first example shows the statement that would be given if one wished to overlay two protein molecules but only to consider the alpha carbons. The second line would be used for the same problem if it were decided to use all the main chain atoms.
TARGET <Chain name> | <Residue 1> - <Residue 2> TARGET <Chain name> | <Residue name>
This statement specifies the target over which the portion of the structure selected on the OVERLAY statement will be superimposed. The specified portion of the structure must be either a single residue or a residue range. It must match the OVERLAY structure residue for residue. No wild cards are allowed in any of the fields.