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Given that sympathetic neural dominance exhibits a similar developmental pattern , and given that clonidine induces sympathetic withdrawal and bradycardia , we hypothesized that clonidine ' s developmental effects on cardiac rate and ultrasound production would mirror each other .
 clonidine, bradycardia, clonidine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 clonidine, bradycardia, clonidine