Swierczek SI, Piterkova L, Jelinek J, et al. Methylation of AR locus does not always reflect X chromosome inactivation state. Blood. 2012;119(13):e100–e109.

On page e100 in the 29 March 2012 issue, the ninth author's middle initial was omitted. The correct name is Bradley R. Cairns. In the “Authorship” on page e109, the initials “B.C.” in the “Contribution” should have read “B.R.C.” The errors have been corrected in the online version, which now differs from the print version.