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Sometimes, when complex concepts with extensive definitions are to be modeled, it is easier to clone an existing concept and then introduce changes to differentiate both, uding the cloned concept as a template for further refinement. For example, we have 36213007 |Endoscopy and brush biopsy (procedure)| with the following definition:
If a child of this concept is needed, like 'Endoscopy and brush biopsy of gastrointestinal tract' it will be much easier efficient to clone the parent and create a procedure site than generating refine it for the child than creating the new concept from scratch.
The definition o