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Using site - directed mutagenesis , we identified three serines ( Ser833 , Ser836 , and Ser840 ) within the membrane proximal region of the GluK5 C - terminal domain that , in combination , are required for mGlu1 - mediated potentiation of KARs .
 Chemical: serines; Chemical: Ser833; Chemical: Ser836; Chemical: Ser840; Chemical: C
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: serines; Chemical: Ser833; Chemical: Ser836; Chemical: Ser840; Chemical: C