3172
In this study , we investigated the specific events involved in beta ( 1 ) AR regulation , focusing on the effects of long - term treatment with beta - adrenergic ligands on receptor processing in stably transfected human embryonic kidney 293 ( i ) cells .
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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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