Syntax:  select {<expression>}

Define the currently selected region of the molecule. All subsequent RasMol commands that manipulate a molecule or modify its colour or representation, only effects the currently selected region. The parameter of a select command is a RasMol expression that is evaluated for every atom of the current molecule. The currently selected (active) region of the molecule are those atoms that cause the expression to evaluate true. To select the whole molecule use the RasMol command select all. The behaviour of the select command without any parameters is determined by the RasMol hetero and hydrogen parameters.

Type "help expression" for more information on RasMol atom expressions.