A polymorphic microsatellite XNP-GT in the XNP/ATRX gene's promotor allows familial indirect diagnosis Communicated by: Richard G.H. Cotton Online Citation: Human Mutation, Mutation and Polymorphism Report #77 (1999) Online http://journals.wiley.com/1059-7794/pdf/mutation/mpr77.pdf Acknowledgments:We would like to thank A. Toutain for providing us with DNA of the family.