Perhaps you should try some spelling variations:
decrease ratio » decreased ratio (Expand search), decrease at (Expand search), decreased rate (Expand search)
ratio decrease » rate decrease (Expand search), brazil decrease (Expand search), to decrease (Expand search)
decrease cell » decreases cell (Expand search)
cell decrease » cells decrease (Expand search), cells decreases (Expand search), will decrease (Expand search)
decrease treg » decrease the (Expand search), decrease their (Expand search)
decrease and » decreases and (Expand search), decrease in (Expand search), decrease of (Expand search)
and decrease » and decreases (Expand search), and decreased (Expand search), and increase (Expand search)
treg pattern » tree pattern (Expand search), eeg pattern (Expand search), turing pattern (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 ratio decrease cell decrease ) OR ( decrease AND decrease treg pattern ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease ratio decrease cell decrease ) OR ( decrease and decrease treg pattern ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease ratio decrease cell decrease ) OR ( decrease and decrease treg pattern ))*.