5396
A 2-kb VDR cDNA insert (including the complete VDR coding region ) was cloned in an antisense orientation into the EBV episomal vector pMEP4 under the control of an inducible promoter and transfected into U937 .
 DNA: 2-kb VDR cDNA insert; protein: VDR; protein: VDR; cell line: U937; DNA: VDR coding region; DNA: inducible promoter
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: 2-kb VDR cDNA insert, VDR, VDR, U937, VDR coding region, inducible promoter 
Answer:
 DNA: 2-kb VDR cDNA insert; protein: VDR; protein: VDR; cell line: U937; DNA: VDR coding region; DNA: inducible promoter