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For safety reasons, the Ad vectors are rendered replication deficient by deletion of the E1a region .
 DNA: E1a region
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: E1a region 
Answer:
 DNA: E1a region