Perhaps you should try some spelling variations:
decreased sperm » decreased sleep (Expand search)
decrease ligand » decrease and (Expand search), decrease lipid (Expand search), decrease lodging (Expand search)
ligand decrease » and decrease (Expand search), ligand release (Expand search), ligands increased (Expand search)
sperm decrease » term decrease (Expand search), speed decrease (Expand search), speed decreases (Expand search)
or decreased » or decrease (Expand search), of decreased (Expand search), or decreases (Expand search)
decrease 1st » decrease akt (Expand search), decrease at (Expand search), decrease std (Expand search)
decrease or » decrease of (Expand search), decrease on (Expand search), decrease pro (Expand search)
1st basic » at basic (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 OR decreased sperm decrease ) OR ( decrease ligand decrease 1st basic ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease or decreased sperm decrease ) OR ( decrease ligand decrease 1st basic ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease or decreased sperm decrease ) OR ( decrease ligand decrease 1st basic ))*.