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Basal CGRP concentration was significantly higher and platelet 5 - HT content tended to be lower in subjects who experienced a migraine attack .
 CGRP, 5 - HT, migraine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 CGRP, 5 - HT, migraine