18511
On the other hand , DOX release from M - PEG - HANPs was pH - dependent : i . e . DOX was slowly released from nanoparticles under physiological condition ( pH7 . 4 ) , whereas its release rates were much higher at mildly acidic environments ( < pH6 . 5 ) .
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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