15209
Moreover , treatment of high - fat - diet - fed apelin - knockout mice with a selective cyclooxygenase - 2 inhibitor , celecoxib , improved vascular function , and also attenuated obesity .
 celecoxib
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 celecoxib