Russian Journal of Bioorganic Chemistry, Vol. 22, No. 1, 1996, pp. 35-42. Translated from Bioorganicheskaya Chimiya, Vol. 22, No. 1. pp. 39-47 Initiation of Degenerate Branched Chain Reaction of Glycin Deamination with Ultraweak UV-Irradiation or Hydrogen Peroxide V. L. Voeikov, I. V. Baskakov, K. Kafkialias, V. I. Naletov. M. V. Lomonosov Moscow State University, Faculty of Biology, 119899, Moscow; M. M. Shemyakin and Yu. A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences. Short irradiation of an aqueous solution of Gly by an ultraweak source of UV photons initiates a process accompanied by the accumulation of ammonia ions. More intense deamination occurs in an aqueous solution in the presence of hydrogen peroxide. The kinetics of ammonia formation coincides with the kinetics of enhancement of luminescence, that was registered in the presence of a luminofore, ethidium bromide or Tyr. When the process was completed, less then 5% of Gly is consumed. At the initial stage of the reaction, the concentration of in the solution increases significantly in comparison with the starting concentration but then begins to decrease. If the luminofore concentration exceeds the optimum, the reaction rate enhancement deccelerates and the ammonia yield decreases. UV photons and are assumed to initiate a degenerate branched chain reaction of Gly deamination. UV photons generated in the reaction system after the process initiation supposedly play a significant role in the process development and reaction chain branching.