Congenital hypothyroidism, as studied in rats. Crucial role of maternal thyroxine but not of 3,5,3’-triiodothyronine in the protection of the fetal brain. - Calvo,R.; Obregon,M.J.; Ruiz de Ona,C.; Escobar del Ray,F.; Morreale de Escobar,G. (J Clin Invest, 1990)