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We conclude that blood serotonin is a useful marker for brain serotonin levels in the rat following acute administration of MDMA and this finding highlights the possible use of platelet serotonin as a marker for brain serotonin in human studies involving MDMA .
 Chemical: serotonin; Chemical: serotonin; Chemical: MDMA; Chemical: serotonin; Chemical: serotonin; Chemical: MDMA
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: serotonin; Chemical: serotonin; Chemical: MDMA; Chemical: serotonin; Chemical: serotonin; Chemical: MDMA