Can I use truncation or a wildcard to search for word stems?
 
You can search for word stems by using the truncation symbol, which is a percent sign (%). You can use this wildcard symbol at the end or in the middle of a search term.

Examples:

immuno%
finds:
immunology
immunomodulator
immunomodulators
immunomodulatory
immunosuppressant
etc

metalloprot%ase
finds:
metalloprotease
metalloproteinase