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The structure of these genes suggests a common ancestor for all viperid PLA2 genes .
 GENE: viperid PLA2 genes
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: viperid PLA2 genes 
Answer:
 GENE: viperid PLA2 genes