9144
In the present work we studied the in vivo effect of a classic chronic dosing schedule of MDMA in rats , alone or combined with a chronic schedule of NIC , on the density of nAChR and on serotonin reuptake transporters .
 Chemical: MDMA; Chemical: NIC; Chemical: serotonin
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: MDMA; Chemical: NIC; Chemical: serotonin