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Consequently, MRX families can only be distinguished by mapping studies; yet, due to imprecise mapping studies performed in the past, the number of genes causing MRX is debatable, and a more precise localization for families is necessary to estimate this number. MRX 9 has been mapped to the pericentromeric region Xp21\u2010q13. We refined the mapping of the MRX9 family to Xp11.22\u2010Xp11.4. A sequencing analysis of three likely candidate genes in Xp11, <jats:italic>SREB3, synapsin I<\/jats:italic>, and <jats:italic>TM4SF2<\/jats:italic>, revealed no mutations. \u00a9 2002 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/ajmg.10663","type":"journal-article","created":{"date-parts":[[2002,10,9]],"date-time":"2002-10-09T02:32:57Z","timestamp":1034130777000},"page":"17-22","source":"Crossref","is-referenced-by-count":3,"title":["Family MRX9 revisited: Further evidence for locus heterogeneity in MRX"],"prefix":"10.1002","volume":"112","author":[{"given":"Birgitta","family":"Winnepenninckx","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vanessa","family":"Errijgers","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Edwin","family":"Reyniers","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter P.","family":"De Deyn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fatima E.","family":"Abidi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Charles E.","family":"Schwartz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R. 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