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We then analyzed the expression of the master GATA1 gene , which encodes a finger transcription factor required for normal erythroid development; addition of RA to HPC stimulated into unilineage erythropoietic differentiation in liquid culture caused a virtually complete inhibition of GATA1 mRNA induction .
 GATA1, HPC, master GATA1 gene, finger transcription factor, GATA1 mRNA
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:
 GATA1, HPC, master GATA1 gene, finger transcription factor, GATA1 mRNA