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In addition , MA resulted in a significant increase in the lung serotonin concentration and the marked upregulation of tryptophan hydroxylase 1 , vesicular monoamine transporter 2 , serotonin transporter , and downregulation of monoamine oxidase - A .
 Chemical: serotonin; Chemical: tryptophan; Chemical: serotonin; Chemical: monoamine
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: tryptophan; Chemical: serotonin; Chemical: monoamine