The cytoprotective protein MANF promotes neuronal survival independently from its role as a GRP78 cofactor by Eesmaa, Ave Yu, Li-Ying Göös, Helka Nõges, Kristofer Kovaleva, Vera Hellman, Maarit Zimmermann, Richard Jung, Martin Permi, Perttu Varjosalo, Markku Lindholm, Päivi Saarma, Mart