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In some early B cells and Abelson murine leukemia virus - transformed pre - B - cell lines , LT mRNA is constitutively expressed .
 GENE: LT mRNA
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: LT mRNA