Properties of companion galaxies strengthen the idea that the probability of the inner regions of an active galaxy being hidden from our view by dust depends on environmental and evolutionary factors.
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Gaskell, M. Unifying active galactic nuclei. Nature Phys 10, 414–415 (2014). https://doi.org/10.1038/nphys2976
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DOI: https://doi.org/10.1038/nphys2976
