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The transcriptional start site , identified by primer extension and S1 nuclease assay , is 34 nt upstream of the translation initiation codon .
 GENE: S1 nuclease
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: S1 nuclease