Gene expression >>> epigenetic changes. Epigenetics is just one of the mechanisms that regulate gene expression in some organisms, but there are many many more

Gene expression >>> epigenetic changes. Epigenetics is just one of the mechanisms that regulate gene expression in some organisms, but there are many many more mechanisms at play. All cells of a given cell type don't express the same genes at the same level, or even maintain the same expression profile from hour to hour.