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In a model where foreign cells ( rat fibroblasts ) were cocultured with human IL-2 activated NK cells , we observed that NK cells were capable of efficiently killing their targets only if the cells overexpressed the oncogene c-Myc or E1A .
 cell type: NK cells; protein: E1A; cell type: NK cells; cell type: foreign cells; protein: c-Myc; cell type: human IL-2 activated NK cells; protein: IL-2; cell type: rat fibroblasts
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: NK cells, E1A, NK cells, foreign cells, c-Myc, human IL-2 activated NK cells, IL-2, rat fibroblasts 
Answer:
 cell type: NK cells; protein: E1A; cell type: NK cells; cell type: foreign cells; protein: c-Myc; cell type: human IL-2 activated NK cells; protein: IL-2; cell type: rat fibroblasts