Regulation of iron absorption and transport. Iron for use in synthesis of heme, iron-sulfur centers and other non-heme iron proteins is obtained from the diet and via release of recycled iron from macrophages of the reticuloendothelial system that ingest old and damaged erythrocytes (red blood cells).
Four-stroke oil is more like the oil used in cars but both 2-stroke and 4-stroke oil serve the same purpose - to keep the engine lubricated. Four-stroke dirt bike oil comes in a variety of weights like 10w-40, 20w-50 and so on. It is not mixed with gas.
The most popular KTM Dirt Bike, the KTM 200 EXC, has power band of the 200cc engine but weighs similar to a typical 125cc Dirt Bike. The KTM 200 EXC costs around 6,000 dollars. KTM also has a similarly popular family of Dirk Bikes the KTM SX series.