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At the low protein concentration of only 11 micro g / mL the 50 kDa fraction still entails a cell mortality of 76 % for A549 and 87 % for PC3 cell lines .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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