Perhaps you should try some spelling variations:
"50 ng_ decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "50 mg_ decrease" (Expand Search), "10 ng_ decrease" (Expand Search), "5 ng_ decrease" (Expand Search)
"50 nn decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 ns decrease" (Expand Search), "50 n decrease" (Expand Search), "59 nn decrease" (Expand Search)
"50 ng decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 we decrease" (Expand Search), "50 mg decrease" (Expand Search), "10 ng decrease" (Expand Search), "5 ng decrease" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("50 ng_ decrease") OR ((("50 nn decrease") OR ("50 ng decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 ng_ decrease\") OR (((\"50 nn decrease\") OR (\"50 ng decrease\"))))".
• Removing quotes may allow a broader search: (( 50 ng_ decrease ) OR ((( 50 nn decrease ) OR ( 50 ng decrease )))).
• Adding a wildcard symbol may retrieve word variants: (("50 ng_ decrease") OR ((("50 nn decrease") OR ("50 ng decrease"))))*.