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In page SRPX2:

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Mutations in SRPX2 were linked in one 2006 study to a family with a form of Rolandic epilepsy with intellectual disability and speech dyspraxia, however later studies showed that SRPX2 do not necessarily lead to epilepsy or intellectual disability. Additionally, no mutations in SRPX2 have been reported with Rolandic epilsepy since.[1] In mice, mutations in SRPX2 lead to decreased frequency of ultrasonic vocalisations in pups when separated from mothers.[2]