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In page Ataxia–telangiectasia:

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These hypotheses may not be mutually exclusive, and more than one of these mechanisms may underlie neuronal cell death when there is an absence or deficiency of ATM. Furthermore, cerebellar damage and loss of Purkinje and granule cells do not explain all of the neurologic abnormalities seen in people with A–T. The effects of ATM deficiency on the other areas of the brain outside of the cerebellum are being actively investigated.[citation needed]