5087
Studies using an inhibitor or a mutant Lb proteinase indicated that stimulation of IRES - driven translation is mediated via proteolysis of some cellular component ( s ) .
 mutant Lb proteinase
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 mutant Lb proteinase