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Mutant M proteins were tested for their ability to complement growth of the temperature - sensitive M protein mutant virus tsO23 at the nonpermissive temperature .
 GENE: Mutant M proteins; GENE: M protein 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: Mutant M proteins; GENE: M protein mutant