Urgent help!!! Biology-Genetics!!?

Haemoglobin A is produced in red-blood cell (RBC) precursors but not in neurons. Focusing on regulation of transcription and using what we've learned of gene control, what factors would turn "off" gene expression in neurons, and turn gene expression "on" in RBC precursors?

NOTE: Address the cells as they are right now, you don't have to talk about tissue differentiation (fetal development). Think of it this way: you have two cell types, a gene is off in one of them and on in another, if you could look into the nucleus what would be different between the two cells that explains why the gene is expressed in one and not the other. 

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