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  Neurotransmitter Candidates in the Dorsal Horn  
   
  An illustration of a model for Transcription Control demonstrating how twin phosphorylation and dephosphorylation reactions of promoter genes CREB and TATA regulate the transcription of dynorphin.  
     
  Distribution of chemical messengers within axons descending from the brain (blue), primary afferent fibers transmitting from skin and tissues (pink), and intrinsic "relay" neurons.  
     
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