20591
Conversely , an equivalent vast literature supports the role of aberrant CNS DA expression and DA receptor signaling in the etiology and persistence of major psychiatric illnesses and has established selective targeting of DA - ergic systems as a cornerstone of pharmacotherapeutic intervention and current neuroleptic drug development .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None