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As G - protein - coupled receptors ( GPCRs ) mediate a multitude of cellular signal transduction events , affecting more or less all human disease areas , it is , therefore , no surprise that they comprise the largest family of current drug targets .
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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:
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