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One of the noticeable features of damage to the cerebellum is ataxia and includes a progressive loss of coordination, strength and fine motor control, as well as an increase in tremors. These features of Machado-Joseph Disease (MJD) mean that a person with MJD will gradually become less and less able to sign their signature as a way of identifying themselves. This may raise issues for the organisation that needs to identify the person. This Help Sheet provides information about the impact of MJD on on an individual’s ability to demonstrate their identity via a signature.