12856
For Pdots we found that passivation with uncharged hydroxy - terminated polyethylene glycol caused a dramatic reduction in nonspecific cell binding and aggregation compared to a charged coating .
 hydroxy, polyethylene glycol
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 hydroxy, polyethylene glycol