18499
These results suggest that ROR alpha and REV - ERB alpha consist of a reciprocating mechanism wherein ROR alpha upregulates the expression of DRD3 , whereas REV - ERB alpha periodically suppresses the expression at the time of day when REV - ERB alpha is abundant .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None