Perhaps you should try some spelling variations:
"key regulatory properties" » "key regularity properties", "key regular properties", "key regulatory perspectives", "key regulator properties", "key regulators properties", "4 regulatory properties"
"3 regulatory properties" » "3 regularity properties", "3 regular properties", "3 regulatory perspectives", "_ regulatory properties", "3 regulation properties"
"a regulatory properties" » "a regularity properties", "a regular properties", "a regulatory perspectives", "_ regulatory properties"
"3 regulatory peptides" » "3 regulatory regimes", "_ regulatory peptides", "3 regulation peptides"

Try widening your search to All Fields.

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("key regulatory properties") OR ((((("3 regulatory properties") OR ("3 regulatory peptides"))) OR ("a regulatory properties")))).
• Removing quotes may allow a broader search: (( key regulatory properties ) or ((((( 3 regulatory properties ) or ( 3 regulatory peptides ))) or ( a regulatory properties )))).
• Adding a wildcard symbol may retrieve word variants: (("key regulatory properties") or ((((("3 regulatory properties") or ("3 regulatory peptides"))) or ("a regulatory properties"))))*.