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Here , we provide an overview of the present knowledge of the role of nucleotides in nociception , with a particular emphasis on G protein - coupled P2Y receptors and their involvement in the communication between first - and second - order neurons in sensory nerve pathways and surrounding glial cells .
 Chemical: nucleotides
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: nucleotides