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 can » decrease in (Expand search), decrease and (Expand search), decrease at (Expand search)
can decrease » and decrease (Expand search), can increase (Expand search), the decrease (Expand search)
decrease to » decreased to (Expand search), decrease toc (Expand search), decrease the (Expand search)
decrease β » decrease _ (Expand search), decrease in (Expand search), decrease of (Expand search)
β affected » _ affected (Expand search), 8 affected (Expand search), c affected (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 can decrease ) OR ( decrease to decrease β affected ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease treg decrease can decrease ) OR ( decrease to decrease β affected ))*.