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).
In elderly people, deposits of transthyretin protein cause a condition called senile systemic amyloidosis. People with this condition do not have a mutation in the TTR gene; for reasons that are unclear, the transthyretin protein abnormally begins to form protein deposits.