10171
Male Sprague - Dawley rats were exposed to hypoxia ( 10 +/- 0 . 5 % O2 ) for 17d and intervened with APO and RS in the last 6d .
 APO
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 APO