1920
Okadaic acid treatment of both cell types was associated with activation of pp90rsk .
 protein: pp90rsk
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: pp90rsk 
Answer:
 protein: pp90rsk