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This feature article describes the construction of a diverse fragment library and an analysis of the screening of six representative protein targets belonging to three diverse target classes ( G protein - coupled receptors ADRB2 , H1R , H3R , and H4R , the ligand - gated ion channel 5 - HT3R , and the kinase PKA ) using chemogenomics approaches .
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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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