TY JOUR TI DEPENDENT FEATURES OF PURINE NUCLEOTIDE METABOLISM, PROOXIDANT AND ANTIOXIDANT SYSTEMS OF STOMACH CANCER PATIENTS KW age KW purines nucleotides KW pro-oxidants KW antioxidants KW reactive oxygen species KW gastric cancer JO Russian Journal of Biological Physics and Chemisrty AU Zuikov, S.A. AU Khomutov, E.V. AU Shatova, O.P. PY 2016 IS 1 PB Federal State Educational Institution of Higher Education Sevastopol State University