22388
Upon E3 ' deletion , the locus became rapidly silenced and lost positive histone epigenetic marks , and the mature B cells partially dedifferentiated , induced RAG - 1 and - 2 along with certain other pro - B cell makers , and then redifferentiated after triggering Ig lambda gene rearrangements .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None