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GATA-1 and ER bind to each other in vitro in the absence of DNA.
 protein: ER; protein: GATA-1
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: ER, GATA-1 
Answer:
 protein: ER; protein: GATA-1