24300
In addition , cobalt protoporphyrin ( CoPP ) , a specific HO - 1 inducer , predominantly suppressed LPS - induced NO production .
 cobalt protoporphyrin, CoPP, NO
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 cobalt protoporphyrin, CoPP, NO