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 is the difference between bread flour and all-purpose flour? Can they be interchanged? Bread flour is a high-gluten flour that has very small amounts of malted barley flour and vitamin C or potassium bromate added.