30526
Motor facilitation induced by NOP receptor antagonists as well as low dose N / OFQ is mediated through D2L postsynaptic receptors whereas motor inhibition observed with higher doses of N / OFQ occurs by direct inhibition of mesencephalic DA neurons .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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