Perhaps you should try some spelling variations:
"pathogen recognition" » "action recognition", "motion recognition", "protein recognition"
"antigen recognition" » "action recognition"
"pattern recognition" » "patterns recognition"

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: (((("pathogen recognition") OR ("antigen recognition"))) OR ("pattern recognition")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"pathogen recognition\") OR (\"antigen recognition\"))) or (\"pattern recognition\"))".
• Removing quotes may allow a broader search: (((( pathogen recognition ) OR ( antigen recognition ))) or ( pattern recognition )).
• Adding a wildcard symbol may retrieve word variants: (((("pathogen recognition") OR ("antigen recognition"))) or ("pattern recognition"))*.