BIOCHEMISTRY AND MOLECULAR BIOLOGY
BIOCHEMISTRY AND MOLECULAR BIOLOGY the regulation of metabolism by external factors that provide communication between cells. The vital activity of each individual cell is subordinated to the needs of the organism as a whole. An animal cannot exist without a complex system of intercellular communications, which are carried out through a diverse system of commands. Now it turned out that the external control of cells is much more difficult than one might imagine. The mechanisms that carry out individual types of regulation are known, but it is not completely clear how all regulatory factors are combined into a single system in the whole organism or at least in a single cell. Communication between cells is provided by signaling molecules. They are released from some cells and migrate to others equipped with receptors capable of receiving these signals. These are target cells. Binding of the signaling molecule to the receptor leads to a biochemical response of the cell. The signal ca...