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To assay for sequences that could potentially regulate Xenopus proenkephalin expression , we transfected constructs that contained upstream genomic sequences linked to the CAT reporter gene into various eukaryotic cell lines .
 GENE: Xenopus proenkephalin; GENE: CAT reporter gene
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: Xenopus proenkephalin; GENE: CAT reporter gene