This information is used to determine the density of the air entering the combustion chamber (in conjunction with the IAT (Intake Air temperature) sensor), which is used when calculating the proper air/fuel mixture for the engine, especially at WOT since the system is not in closed-loop at this time.
The TTR gene provides instructions for producing a protein called transthyretin. This protein transports vitamin A (retinol) and a hormone called thyroxine throughout the body. To transport thyroxine, four transthyretin proteins must be attached (bound) to each other to form a four-protein unit (tetramer).
The other two protein molecules that form the thin filaments are called troponin and tropomyosin. The molecules of tropomyosin cover the myosin-binding sites on the actin molecules when the muscle fibres are relaxed. Myosin and actin form the main contractile elements of muscles. This is because it is the binding of the thick filaments to the thin filaments and in particular the positions of these points of attachment, that controls the state of contraction / relaxation of the muscle of which they are apart.