The federal acquisition regulation (FAR) is divided into 53 parts. However, many of these parts do not contain regulations. They are reserved for future regulations.
It can depend. Usually Zoniing regulations would cover the display of the signs, but building regulations would address the way they are constructed and hung or placed on the building.
Up-regulation is where a cell creates more receptor due to little ligand activity. Down-regulation is the opposite. They are caused by intracelluar processes.
