1186
The decrease in the heart rate ( HR ) induced by the beta - AR antagonist metoprolol in conscious rats was significantly attenuated in TGR compared with SD rats ( - 9 . 9 + / - 1 . 7 % vs . - 18 . 1 + / - 1 . 5 % ) , whereas the effect of parasympathetic blockade by atropine on HR was similar in both strains .
 Chemical: metoprolol; Chemical: atropine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: metoprolol; Chemical: atropine