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One problem in using these clonality analysis methods , however, is that there may be significant variation in Lyonization in blood cells in normal individuals .
 cell type: blood 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: blood cells 
Answer:
 cell type: blood cells