What Is the Key Function of Vitamin a in Gene

What is the key function of Vitamin A in gene expression?

A) Retinoic acid must bind to a protein in the cell membrane to ensure that a signal is sent to the nucleus to initiate gene expression..
B) Retinoic acid binds to mRNA to ensure that translation occurs.
C) Retinoic acid binds to mRNA to ensure that transcription occurs.
D) Retinoic acid must bind to a protein receptor and then the retinoic acid-protein receptor is able to bind to a regulatory region of DNA.

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