The signal transduction pathway is the mechanism by which the energy of a photon signals a mechanism in the cell that leads to its electrical polarization. 1  This polarization ultimately leads to either the transmittance or inhibition of a neural signal that will be fed to the brain via the optic nerve.
The Inland Empire (I.E.) is a metropolitan area and region of Southern California. It is situated directly east of the Los Angeles metropolitan area.
emperors between 1438 and 1493, the Inca state expanded into a great empire.From a geographic point of view, the Inca empire was not a very attractive place to live. The north-western border is the coastal region of the Pacific Ocean, which is the driest desert on earth.