29463
RESULTS : The objective of this review is to describe the multiple cellular pathways through which chronic nicotine exposure regulates nAChR expression , and to juxtapose these mechanisms with evidence for altered expression of high - affinity nAChRs in human psychiatric illness .
 Chemical: nicotine
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: nicotine