Chronic stress decreases the expression of sympathetic markers in the pineal gland and increases plasma melatonin concentration in rats. by Dagnino-Subiabre, A, Orellana, J, Carmona-Fontaine, C, Montiel, J, Díaz-Velíz, G, Serón-Ferré, M, Wyneken, U, Concha, M, Aboitiz, F