9151
Western blots with specific alpha 4 and alpha 7 antibodies showed no significant differences between the groups , indicating that , as reported for nicotine , up - regulation caused by MDMA is due to post - translational events rather than increased receptor synthesis .
 Chemical: nicotine; Chemical: MDMA
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: nicotine, MDMA 
Answer:
 Chemical: nicotine; Chemical: MDMA