4987
Experimental PE was induced in anesthetized , male Sprague - Dawley rats by infusing 25 mu m polystyrene microspheres ( 1 . 95 million / 100 g body wt , right jugular vein ) producing moderate PE .
 polystyrene
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 polystyrene