[1] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Inst Biol & Med Expt, IBYME, RA-1428 Buenos Aires, DF, Argentina
[2] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Biol Chem, RA-1428 Buenos Aires, DF, Argentina
[3] Univ Geneva, Dept Obstet & Gynaecol, CH-1211 Geneva 4, Switzerland