The apoptotic activity of flavonoid-containing Gratiola officinalis extract in cell cultures of human kidney cancer oleh Natalya V. Polukonova, Nikita А. Navolokin, Alla B. Bucharskaya, Dmitry A. Mudrak, Maria A. Baryshnikova, Eugenia V. Stepanova, Eliso S. Solomko, Anna V. Polukonova, Galina N. Maslyakova