5701
The blockade of both rewarding and aversive associative memories is mediated through a D ( 1 ) - specific signaling pathway , as neither forms of spontaneous memory expression were blocked by intra - PLC microinfusions of a D ( 2 ) - like receptor agonist .
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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