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On the other hand, AML1b conferred a similar differentiation-inducing capacity upon K562 cells transfected with vector alone.
 protein: AML1b; cell line: K562 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: AML1b, K562 cells 
Answer:
 protein: AML1b; cell line: K562 cells