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These findings suggest that MA induced chronic pulmonary toxicity , which is concerned with the elevated serotonin concentration in rat lungs by increased synthesis , reduced metabolism , augmented accumulation , and promoted release of serotonin .
 Chemical: serotonin; 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: serotonin; Chemical: serotonin