Perhaps you should try some spelling variations:
"50 mean decrease" » "50 a decrease" (Expand Search), "20 means decrease" (Expand Search)
"50 ng decrease" » "50 nn decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 mg decrease" (Expand Search), "10 ng decrease" (Expand Search), "50 ns decrease" (Expand Search)
"5 ng decrease" » "5 nn decrease" (Expand Search), "5 _ decrease" (Expand Search), "5 a decrease" (Expand Search), "5 g decrease" (Expand Search), "5 nm decrease" (Expand Search), "5 kg decrease" (Expand Search)
"5 mg decrease" » "5 _ decrease" (Expand Search), "5 a decrease" (Expand Search), "5 nn decrease" (Expand Search), "5 mm decrease" (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("50 mean decrease") OR ("50 ng decrease"))) OR ((("5 ng decrease") OR ("5 mg decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 mean decrease\") OR (\"50 ng decrease\"))) OR (((\"5 ng decrease\") OR (\"5 mg decrease\"))))*".
• Removing quotes may allow a broader search: (((( 50 mean decrease ) OR ( 50 ng decrease ))) OR ((( 5 ng decrease ) OR ( 5 mg decrease ))))*.