Front. neurosci. Front. neurosci. Cotinine Plus Krill Oil Decreased Depressive Behavior, and Increased Astrocytes Survival in the Hippocampus of Mice Subjected to Restraint Stress Mendoza Cristhian Perez-Urrutia Nelson Alvarez-Ricartes Nathalie Barreto George E. Pérez-Ordás Raquel Universidad de Zaragoza Iarkov Alex Echeverria Valentina 2018 research-article