Perhaps you should try some spelling variations:
"a large decrease" » "a marked decrease" (Expand Search), "a large increases" (Expand Search), "a large degree" (Expand Search), "_ large decrease" (Expand Search)
"i large decrease" » "i marked decrease" (Expand Search), "i large increases" (Expand Search), "i large degree" (Expand Search), "_ large decrease" (Expand Search), "via large decrease" (Expand Search), "i larvae decrease" (Expand Search)
"ct levels increased" » "c levels increased" (Expand Search), "wt levels increased" (Expand Search), "cd levels increased" (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: "((\"ct levels increased\") OR (((\"a large decrease\") OR (\"i large decrease\"))))~".
• Removing quotes may allow a broader search: (( ct levels increased ) OR ((( a large decrease ) OR ( i large decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("ct levels increased") OR ((("a large decrease") OR ("i large decrease"))))*.