- Note: UCSC has modified the weight of each SNP that has a single mapping to the same pseudoautosomal region (PAR) on both chrX and chrY, from 3 to 1. dbSNP agrees that the weight should be 1 and will change its pipeline to detect that case and assign a weight of 1 in the future.
  The Y chromosome in this assembly contains two pseudoautosomal regions (PARs) that were taken from the corresponding regions in the X chromosome and are exact duplicates:

  > chrY:10001-2649520 and chrY:59034050-59363566
  > chrX:60001-2699520 and chrX:154931044-155260560