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See artikkel räägib üldmõistest. Filmi kohta vaata artiklit Aju (film). Aju on närvikoest koosnev kompaktne elund, loomade närvisüsteemi keskne osa.
Aju esineb nii selgrootutel kui ka selgroogsetel loomadel.
Selgroogsete loomade aju jaguneb seljaajuks ja peaajuks.
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