Perhaps you should try some spelling variations:
rats decreases » and decreases (Expand search), but decreases (Expand search), stress decreases (Expand search)
decreases treg » decrease treg (Expand search), decreases the (Expand search), decreases stress (Expand search)
decrease rats » decreased rate (Expand search), decreases rate (Expand search), decrease at (Expand search)
treg decrease » the decrease (Expand search), urea decrease (Expand search), drugs decrease (Expand search)
decrease and » decreases and (Expand search), decrease of (Expand search), decrease the (Expand search)
and decrease » and decreases (Expand search), and decreased (Expand search), and increase (Expand search)
in objects » in object (Expand search), on objects (Expand search), and objects (Expand search)

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( decrease rats decreases treg decrease ) OR ( decrease AND decrease in objects ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease rats decreases treg decrease ) OR ( decrease and decrease in objects ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease rats decreases treg decrease ) OR ( decrease and decrease in objects ))*.