ABSTRACT
Introduction The problem of information transmission within and between living cells is as significant as the problem of genetic code because it is a major aspect of irritability, one of the important features of life. Just as genetic code has a common basis in all living organisms in the form of the se quence and combination of several purine and pyrimidine bases, the mechanism of irritability appears to have a common basis in the form of chemical signals, that are uniform for every cell.
