441
These mutants , assayed by injection into Xenopus oocyte nuclei , delimit the promoter to 36 bp of DNA upstream of the cap site and 73 bp of the untranslated mRNA leader .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None