Perhaps you should try some spelling variations:
decrease treg » decrease the (Expand search), increase treg (Expand search), decrease their (Expand search)
treg decrease » the decrease (Expand search), urea decrease (Expand search), drugs decrease (Expand search)
to decreased » to decrease (Expand search), to increased (Expand search), is decreased (Expand search)
decreased by » decreased in (Expand search), increased by (Expand search), decreased ph (Expand search)
decrease to » decreased to (Expand search), decrease toc (Expand search), decrease the (Expand search)
by object » an object (Expand search), en object (Expand search), _ object (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 _ decrease ) OR ( decrease to decreased by object ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease treg decrease _ decrease ) OR ( decrease to decreased by object ))*.