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In particular , the S1 ' specificity site is a deep and highly hydrophobic cavity .
 GENE: S1 ' specificity site
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: S1 ' specificity site 
Answer:
 GENE: S1 ' specificity site