 The structure is often described as crystalline, and the wheels are divided by being split with a fairly blunt almond-shaped knife designed for the purpose, rather than being sliced, cut or sawn.Within the European Union the term "Grana" is legally protected by Grana Padano Protected Designation of Origin; only Grana Padano may be sold using the term in EU countries.The two best-known examples of grana-type cheeses are Parmigiano-Reggiano and Grana Padano.