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Active suppression of the class II transactivator-encoding AIR-1 locus is responsible for the lack of major histocompatibility complex class II gene expression observed during differentiation from B cells to plasma cells .
 DNA: class II transactivator-encoding AIR-1 locus; DNA: major histocompatibility complex class II gene; cell type: plasma cells; cell type: B cells
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: class II transactivator-encoding AIR-1 locus, major histocompatibility complex class II gene, plasma cells, B cells 
Answer:
 DNA: class II transactivator-encoding AIR-1 locus; DNA: major histocompatibility complex class II gene; cell type: plasma cells; cell type: B cells