11204
To extend these initial observations, we have examined the effect of antioxidant treatment on the activity of the mitogen-activated protein kinases erk1 and erk2 , as members of a signal transduction pathway known to directly regulate transcription factor function .
 protein: erk1; protein: erk2; protein: mitogen-activated protein kinases
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: erk1, erk2, mitogen-activated protein kinases 
Answer:
 protein: erk1; protein: erk2; protein: mitogen-activated protein kinases