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The repressor activity of the 5'-UTR was localized to tandem GATA-like sites , which appear to bind a complex of two proteins, one of which is the erythroid transcription factor GATA-1 .
 5'-UTR, transcription factor, GATA-1, erythroid transcription factor, GATA-like sites
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 5'-UTR, transcription factor, GATA-1, erythroid transcription factor, GATA-like sites