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The normal cell cycle is regulated by several molecules, such as the tumor-suppressor protein pRb , the G1 cyclins , the cyclin-dependent kinases , and their inhibitors .
 protein: pRb; protein: G1 cyclins; protein: tumor-suppressor protein pRb; protein: cyclin-dependent 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: pRb, G1 cyclins, tumor-suppressor protein pRb, cyclin-dependent kinases 
Answer:
 protein: pRb; protein: G1 cyclins; protein: tumor-suppressor protein pRb; protein: cyclin-dependent kinases