And so the T three T four levels over time will basically stabilize. Now, let's move on to the final type of hormone released by the thyroid gland known as calcitonin. Now, we know that the Follicular cells release and produce T three and T four. But the power of Follicular cells, also known as the C cells, are the cells that release and produce calcitonin inside our thyroid gland. Now, unlike these two hormones, calcitonin is a peptide hormone. It's a large peptide.