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Foamy viruses ( FVs ) express the Gag protein as a precursor with a molecular mass of 74 kDa ( pr74 ) from which a 70 - kDa protein ( p70 ) is cleaved by the viral protease .
 GENE: Gag protein; GENE: pr74; GENE: p70
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: Gag protein; GENE: pr74; GENE: p70