Perhaps you should try some spelling variations:
"ct largest decrease" » "ct largest decreases" (Expand Search), "ct larger decrease" (Expand Search), "_ largest decrease" (Expand Search)
"ct marked decrease" » "ct marked increase" (Expand Search), "_ marked decrease" (Expand Search), "a marked decrease" (Expand Search), "n marked 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 (((\"ct largest decrease\") OR (\"ct marked decrease\"))))~".
• Removing quotes may allow a broader search: (( ct levels increased ) OR ((( ct largest decrease ) OR ( ct marked decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("ct levels increased") OR ((("ct largest decrease") OR ("ct marked decrease"))))*.