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The best regression model for predicting changes in the WCXR included time to first positive culture and antibody titer for Pa elastase .
 GENE: Pa elastase
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: Pa elastase 
Answer:
 GENE: Pa elastase