Perhaps you should try some spelling variations:
significantly improved » significantly increased (Expand Search)
significantly marked » significantly larger (Expand Search), significantly linked (Expand Search), significantly impaired (Expand Search)
improved decrease » improved urease (Expand Search)
marked decrease » marked increase (Expand Search)

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

• Removing quotes may allow a broader search: (( significantly marked decrease ) OR ( significantly improved decrease ))~.