title: Counting chromosomes: not as easy as 1, 2, 3.
abstract: Mammalian cells must count their X chromosomes to determine whether to initiate X chromosome inactivation. A region that may be important for X chromosome counting has been identified, but the puzzle pieces still do not quite fit.
authors.affiliation: University of California, San Francisco, Department of Biochemistry and Biophysics, 600 16th Street, Box 2200, San Francisco, California 94158, USA.
authors.forename: Mary Kate
authors.initials: MK
authors.lastname: Alexander
authors.forename: Barbara
authors.initials: B
authors.lastname: Panning
mesh_terms: D000818:Animals; D033481:Chromosomes, Mammalian / Q000235:genetics*; D017353:Gene Deletion; D008322:Mammals / Q000235:genetics*; D008957:Models, Genetic; D062085:RNA, Long Noncoding; D022661:RNA, Untranslated / Q000235:genetics; D019076:Transgenes / Q000235:genetics; D049951:X Chromosome Inactivation / Q000235:genetics / Q000502:physiology*
chemical_list: D062085:RNA, Long Noncoding; D022661:RNA, Untranslated; C077885:XIST non-coding RNA