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Our experiments suggest that the SCL gene can be a target for the erythroid transcription factor GATA - 1 and that the SCL gene product serves as a positive regulator of erythroid differentiation .
 SCL gene, erythroid transcription factor GATA - 1, SCL gene product
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 SCL gene, erythroid transcription factor GATA - 1, SCL gene product