1782
The finding of cocaine - induced vasoconstriction in segments of ( noninnervated ) human umbilical artery suggests that the presence or absence of intact innervation is not sufficient to explain the discrepant data involving the possibility of alpha - mediated effects .
 cocaine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 cocaine