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. Author manuscript; available in PMC: 2014 Mar 1.
Published in final edited form as: Nat Genet. 2013 Jul 21;45(9):1083–1087. doi: 10.1038/ng.2705

Table 1.

X-chromosome sequence assemblies in placental mammals

Organism Sequencing strategy # of gaps in X assembly X-ampliconic sequence (Mb) % of X chromosome composed of amplicons
Human clone-based 5 3.15 2.0
Mouse clone-based 25 19.42 11.6
Chimpanzee whole-genome shotgun 10286 0.00* 0.00*
Rhesus whole-genome shotgun 1996 0.16* 0.05*
Dog whole-genome shotgun 215 0.05* 0.04*
Horse whole-genome shotgun 2240 0.00* 0.00*
Cow whole-genome shotgun 442 1.40* 0.93*

Human data reflects our revised, SHIMS-based assembly. Asterisks denote numbers based on whole-genome shotgun assemblies, which likely underestimate X-ampliconic content.