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The set of elements that are not in a specified set.

In set theory, the complement of set $A$ refers to all elements not in set $A$ .
In , the complement of a of consists of all concepts that are not in that subset.

The following defines the set of concepts that are of that are also part of the complement of the. The "MINUS" instruction excludes members of the reference set, so only that are part of the complement of that set are included.
<442083009 | Anatomical or acquired body structure| MINUS ^723264001 |Lateralizable body structure reference set|