11437
At temperatures below the second block ' s LCST ( i . e . , below 37 degrees C for in vitro assays ) , the diblock copolymer was fully water - soluble , and when heated to 37 degrees C , the polymer self - assembled into a narrow size distribution of nanoparticles with an average diameter of approximately 25 nm .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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