DIFFERENCE

Syntax DIFFERENCE RESIDUE SELECT ... END SELECT ... END

            SEQUENCE
            COORDINATES
            ATOM_NAMES
            CLASS
            CHARGE
            COLOR
            RADII
            TEMPERATURE
            WEIGHT
            INTERNAL  DISTANCE
                      ANGLES
                      DIHEDRALS
                      (ALL)
            POINTS    SURFACE
                      POTENTIAL

Syntax is the same as by COPY. Only the relation is different. Relation is here A := A - B. However, the results of a string (RESIDUE, SEQUENCE, ATOM) subtraction is, when the corresponding strings in A and B are the same, blanks and, when they are different, the string in A is not modified. When subtracting RESIDUE names of two SELECTIONS, are the places of mutations easy to see with a

MAIN> write sequence residue

sentence.