part_of conserved_region telomere X_element 2009-11-10T10:56:54Z SO:0001497 X element core sequence X element kareneilbeck The X element is a conserved region, of the telomere, of ~475 bp that contains an ARS sequence and in most cases an Abf1p binding site. sequence Possible functions include roles in chromosomal segregation, maintenance of chromosome stability, recombinational sequestering, or as a barrier to transcriptional silencing. This term was requested 2009-10-16 by Michel Dumontier, tracker id 2880747. From Janos Demeter: The only region shared by all chromosome ends, the X element core sequence is a small conserved element (~475 bp) that contains an ARS sequence and in most cases an Abf1p binding site. Between these is a GC-rich region nearly identical to the meiosis-specific regulatory sequence URS1.