5415
We found that NDAT becomes phosphorylated at single distinct sites by protein kinase A ( Ser - 7 ) and calcium - calmodulin - dependent protein kinase II ( Ser - 13 ) and at multiple sites ( Ser - 4 , Ser - 7 , and Ser - 13 ) by protein kinase C ( PKC ) , implicating these residues as potential sites of DAT phosphorylation by these kinases .
 Chemical: Ser; Chemical: calcium; Chemical: Ser; Chemical: Ser; Chemical: Ser; Chemical: Ser
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: Ser; Chemical: calcium; Chemical: Ser; Chemical: Ser; Chemical: Ser; Chemical: Ser