One sentence buried more than 1,500 pages into a fiscal 2020 spending bill the U.S. Senate passed Thursday could open the door to a broader range of insulin biosimilars. The provision, requested by the FDA, expands the definition of a “biological product” to include chemically synthesized polypeptides. The provision, requested by the FDA, expands the definition of a “biological product” to include chemically synthesized polypeptides.