26631
The microparticles were demonstrated to be non - cytotoxic till 300 mu g / 2 x 10 ( 5 ) cells and revealed a maximum release of 250ng GDNF - CBP / mg microparticles in 0 . 3 % collagenase .
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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:
 None