- Transthyretin regulates thyroid hormone levels in the choroid plexus, but not in the brain parenchyma: study in a transthyretin-null mouse model. Palha, J.A., Fernandes, R., de Escobar, G.M., Episkopou, V., Gottesman, M., Saraiva, M.J. Endocrinology (2000)