Auto Explode

The term Auto Explode is used by Ovid. It means that the subject heading that you've selected will automatically explode - the system will automatically search the particular subject heading and any others that are more specific. Auto Explode is the default choice on the Mapping Display screen.

PubMed automatically explodes the subject heading from the query line as part of the searching algorithm. The only way to NOT explode is to use the MeSH Database and select "Do Not Explode this term".