1467
Gel retardation experiments established that this IRE motif formed a protein - RNA complex with cytosolic extracts from human K562 cells and this binding was strongly competed with IRE transcripts from ferritin or transferrin receptor mRNAs .
 RNA: IRE transcripts; protein: protein - RNA complex; cell line: human K562 cells; RNA: IRE motif
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 RNA: IRE transcripts; protein: protein - RNA complex; cell line: human K562 cells; RNA: IRE motif