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This elevation in urinary peptides was similar to that in 35 girls with infantile autism. As in persons with autism, the individual levels of urinary peptides in the Rett syndrome group varied, and about a fifth were within the normal range. Levels of peptides were lower in girls with classic Rett syndrome than in girls with congenital Rett syndrome. This may be due to different etiological causes or to active and stagnant phases of the disease. Urine from girls with Rett syndrome was found to have higher frequency and higher levels of some urinary peptides that may cause inhibition of brain maturation and epilepsy.<\/jats:p>","DOI":"10.1177\/1362361302006003008","type":"journal-article","created":{"date-parts":[[2003,11,2]],"date-time":"2003-11-02T13:31:07Z","timestamp":1067779867000},"page":"315-329","source":"Crossref","is-referenced-by-count":8,"title":["Urinary Peptides in Rett Syndrome"],"prefix":"10.1177","volume":"6","author":[{"given":"K. 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