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Phosphorylation at Ser ( 670 ) impairs the ability of GRK2 to phosphorylate both soluble and membrane - incorporated receptor substrates and dramatically attenuates Gbetagamma - mediated activation of this enzyme .
 GENE: GRK2; GENE: Gbetagamma
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: GRK2; GENE: Gbetagamma