20592
The present short review focuses on potential functional / behavioral alterations linked to polymorphisms in the primary DNA sequence of the DA receptor type 4 ( DRD4 ) gene in reference to major psychiatric illnesses .
 None
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