Using immunocytochemical methods, the expression of bcl-2 antiapoptotic protein was studied in developing brain of human 5-8-week embryos. It was established that during the period studied several zones of bcl-2-positive cell concentration were present. These included the ventricular zone of the brain vesicles wall, cortical plate, medullary nuclei, vascular plexus primordium (in 5-6-week embryos), IV ventricle roof and vascular plexus of rhombencephalon. In the area of forming leptomeninx, bcl-2 protein was demonstrated in the endothelium of blood vessels. The detection of intensified expression of bcl-2 protein in some cellular populations of developing human brain proves their increased stability against apoptosis and indicates their priority significance in the provision of normal neurohistogenesis.