In the early stages of the formation of an organism, cells are the same and are pluripotent, which means, they can differentiate into different cell types, such as muscle cells (myocytes), fibroblasts, neurons, among others.
For pluripotent cells to differentiate into a cell, specific genes must be silenced, while others must be functioning. For this reason, the regulation of gene expression is important, as it controls which genes will be active and which genes will be silenced, and therefore controls cell differentiation.