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We have systematically analyzed the functional roles of these factor binding motifs of HS-40 by site-directed mutagenesis and transient expression assay in erythroid cell cultures .
 cell line: erythroid cell cultures; DNA: factor binding motifs; DNA: HS-40
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: erythroid cell cultures, factor binding motifs, HS-40 
Answer:
 cell line: erythroid cell cultures; DNA: factor binding motifs; DNA: HS-40