2744
METHODS : Thoracic aorta of male Sprague - Dawley rats was exposed to 0 . 5M CaCl ( 2 ) or normal saline ( NaCl ) .
 CaCl ( 2 ), NaCl
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 CaCl ( 2 ), NaCl