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In human WI38 cells , the E1B 19K gene mutant viruses had a substantial growth advantage over the wild - type virus , yielding 500 - fold - higher titers .
 GENE: E1B 19K gene mutant
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: E1B 19K gene mutant