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In page Hereditary sensory and autonomic neuropathy type I:

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HSAN IB is linked to a 3.42 cM interval on chromosome 3p22–p24.[1] This finding was confirmed in another family with similar clinical features. However, mutation analysis of genes in the candidate region has not revealed any disease-causing gene.[2] Since then, this rare form of HSAN I has not been reported in other families. The gene associated with the disease still remains to be identified.[citation needed]