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Then , we evaluated the expression of pro - opiomelanocortin ( POMC ) , alpha - melanocyte stimulating hormone ( alpha - MSH ) , cocaine and amphetamine - regulated transcript ( CART ) , neuropeptide Y ( NPY ) , agouti - related peptide ( AgRP ) and others in different hypothalamic nuclei in order to better understand the mechanisms underlying the obese phenotype observed in these animals at adulthood .
 Chemical: cocaine; Chemical: amphetamine
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: cocaine; Chemical: amphetamine