The USDA's AMR guidelines restrict the processing of the parts of cattle that may contain central nervous tissue from AMR systems in cattle over 30 months of age. However, non-CNS tissue meat can be processed and is considered meat, as are the muscle cuts. Although some sources claim AMR systems use ammonia (or anhydrous ammonia, ammonia hydroxide, etc.) to treat the meat, this appears to be due to confusion between AMR and the production of lean finely textured beef (LFTB, commonly referred to as pink slime). LFTB is in fact treated with ammonia, and so is substantially more restricted than most AMR products.