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Olfactory MRI of the probands. Brain MRIs at T2 coronal sections are shown. The arrowheads indicate olfactory bulbs. (a) A healthy young adult displaying anatomically normal olfactory bulbs. (b) The absence of olfactory bulbs (aplasia) in the proband from family 1. (c and d) Normal olfactory bulbs in the proband from family 2 and 4, respectively.
