[1] Mouritsen, H., Janssen-Bienhold, U., Liedvogel, M., Feenders, G., Stalleicken, J., Dirks, P., and Weiler, R., “Cryptochromes and neuronal-activity markers colocalize in the retina of migratory birds during magnetic orientation”, Proceedings of the National Academy of Sciences, vol. 101, no. 39. Proceedings of the National Academy of Sciences, pp. 14294-14299, 2016.