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To determine the genetic basis for the differences between the cardiac and brain AE3 variants , we isolated and characterized the rat gene .
 GENE: brain AE3 variants
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: brain AE3 variants 
Answer:
 GENE: brain AE3 variants