8207
Ki - ras4BVal - 12 transfectant cells expressed 2 - fold elevated protein levels of the lysosomal cysteine protease cathepsin B but did not up - regulate cathepsin B mRNA expression .
 Ki - ras4BVal - 12, lysosomal cysteine protease, cathepsin B, cathepsin B mRNA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 Ki - ras4BVal - 12, lysosomal cysteine protease, cathepsin B, cathepsin B mRNA