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In a T-cell clone specific for pigeon cytochrome c in the context of I-Ek , Oct-2 was induced by antigen stimulation , with the increase in Oct-2 protein seen first at 3 h after activation and continuing for at least 24 h.
 protein: I-Ek; protein: Oct-2; cell line: T-cell clone; protein: pigeon cytochrome c; protein: Oct-2; protein: Oct-2 protein
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: I-Ek; protein: Oct-2; cell line: T-cell clone; protein: pigeon cytochrome c; protein: Oct-2; protein: Oct-2 protein