(biochemistry) A series of chemical reactions within a cell which start when a transmembrane protein comes into contact with a chemical signal, resulting in a second messenger being triggered.

(endocrinology) A type of cell signaling involving the release of a hormone from a nerve cell that has an effect on another cell.

(biology) A biochemical sequence in which one molecule that receives a signal activates another molecule

A handgun designed to discharge an illumination flare.

(rail transport) a structure erected over one or more railway tracks, carrying one or more signals. Smaller structures usually have a single support, and larger structures are supported on both sides.

plural of signal gantry

plural of signalling pathway

plural of signal pistol

(economics) A sign, attached to a commodity and concerning its price, that is intended to increase demand for it

plural of signal cabin