12309
This study investigated whether boron would enhance the ability of 17beta - estradiol ( E2 ) or parathyroid hormone ( PTH ) to improve bone quality in ovariectomized OVX rats .
 parathyroid hormone, PTH
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 parathyroid hormone, PTH