854
Although the biochemical properties of native prolidase purified from human erythrocytes , liver , kidney , and fibroblast cells are well known , it is very poorly characterized with regard to its OP hydrolyzing activity .
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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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