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We suggest that extinction of Ig genes is part of a global mechanism that suppresses the differentiation program foreign to the HeLa phenotype .
 cell line: HeLa phenotype; DNA: Ig genes
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: HeLa phenotype, Ig genes 
Answer:
 cell line: HeLa phenotype; DNA: Ig genes