6140
Recent studies suggest that one or more cytoplasmic serine kinases also phosphorylate STAT3 and are necessary for maximal gene activation .
 protein: cytoplasmic serine kinases; protein: STAT3
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: cytoplasmic serine kinases, STAT3 
Answer:
 protein: cytoplasmic serine kinases; protein: STAT3