Keywords: α2-ARs; alpha2-adrenergic receptors; AO; acridine orange; DMEM; Dulbecco's modified Eagle's medium; DMSO; dimethyl sulfoxide; H2O2; hydrogen peroxide; MTT; 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide; NSE; neutron specific enolase;