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The molecular mechanism by which ATRA increases the nuclear abundance of a functional VDR is still unknown, but our data clearly indicate that the M2 leukemic cell context is only permissive of monocytic differentiation .
 protein: VDR; cell line: M2 leukemic cell
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: VDR, M2 leukemic cell 
Answer:
 protein: VDR; cell line: M2 leukemic cell