Affiliation: | (1) Department of Biochemistry, Institute of Biomedical Sciences, Sofia, Bulgaria;(2) Institute of Dermatology and Venereology, Medical Academy, 1431 Sofia, Bulgaria;(3) Unité de Differenciation Cellulaire, Batiment des Biotechnologies I.N.R.A., F-78350 Jouy-en-Josas, France |