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Here, we report that nitric oxide ( NO ) activates p21ras in human T cells as evidenced by an increase in GTP -bound p21ras .
 cell type: human T cells; DNA: p21ras; cell type: T cells; protein: GTP -bound p21ras
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: human T cells, p21ras, T cells, GTP -bound p21ras 
Answer:
 cell type: human T cells; DNA: p21ras; cell type: T cells; protein: GTP -bound p21ras