Expression of phosphoribosyl pyrophosphate synthetase genes in U87 glioma cells with ERN1 knockdown: effect of hypoxia and endoplasmic reticulum stress - O. H. Minchenko; I. A. Garmash; O. V. Kovalevska; D. O. Tsymbal; D. O. Minchenko (The Ukrainian Biochemical Journal, 2014)