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We found that both the E26 virus - encoded v - ets and the myeloid / B - cell - specific factor PU . 1 bind efficiently to this site in vitro .
 GENE: v - ets; GENE: myeloid / B - cell - specific factor PU . 1
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: v - ets; GENE: myeloid / B - cell - specific factor PU . 1