951
Many aspects of leukocyte function are regulated by both heterotrimeric and Ras-related GTP-binding proteins , but there is little definite information about their roles in the specialized processes utilized by leukocytes for cell killing.
 cell type: leukocyte; cell type: leukocytes; protein: heterotrimeric; protein: Ras-related GTP-binding proteins
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:
 cell type: leukocyte; cell type: leukocytes; protein: heterotrimeric; protein: Ras-related GTP-binding proteins