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.
What They Are. Arrowroot starch is made from the dried rootstock of the arrowroot plant, which is then ground into a white powder. The name comes from the manner in which it was used by the South American Aruac Indians, who saw it as an antidote for poisonous arrows.