An overloading of the gel with a soluble protein creates a semicircular band of this protein (e. g. in the marker lane of the image at 66 KDa), allowing other proteins with similar molecular weights to be covered.
Like arrowroot, tapioca also comes from the root of a plant, however, in this case it is the root of the Cassava plant. It is ground into powdered form and is often referred to as tapioca flour.
Arrowroot starch is used as a thickener in many foods such as puddings and sauces. It can also be used in cookies and other baked goods. The starch has an extremely bland taste, which makes it suitable for neutral diets. It is believed that arrowroot helps to soothe upset stomachs/nausea. Arrowroot powder should be whisked into a cool liquid before adding to a sauce or other liquid based recipe, and it should be added towards the end. As overcooking can destroy the gelling properties of arrowroot.