Central nicotine induces browning through hypothalamic κ opioid receptor by Seoane-Collazo, P, Liñares-Pose, L, Rial-Pensado, E, Romero-Picó, A, Moreno-Navarrete, J, Martínez-Sánchez, N, Garrido-Gil, P, Iglesias-Rey, R, Morgan, D, Tomasini, N, Malone, S, Senra, A, Folgueira, C, Medina-Gomez, G, Sobrino, T, Labandeira-García, J, Nogueiras, R, Domingos, A, Fernández-Real, J, Rahmouni, K, Diéguez, C, López, M