Perhaps you should try some spelling variations:
decrease treg » decrease the (Expand search), decrease their (Expand search)
treg decrease » the decrease (Expand search), urea decrease (Expand search), drugs decrease (Expand search)
decrease rate » decreased rate (Expand search), decreases rate (Expand search), decrease at (Expand search)
rate decrease » rats decreases (Expand search), rate increase (Expand search), to decrease (Expand search)
decrease bout » decreased bone (Expand search), decreases bone (Expand search), decreased body (Expand search)
bout effect » out effect (Expand search), joint effect (Expand search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease treg decrease rate decrease ) OR ( decrease AND decrease bout effect ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease treg decrease rate decrease ) OR ( decrease AND decrease bout effect ))*.