On pages e96, e98, and e107 in the 31 March 2011 issue, there is an error in the Web link www.cellline.molbiol.ox.ac.uk/eryth/index.html; the “www.” should have been “https://.” The URL should have been “https://cellline.molbiol.ox.ac.uk/eryth/index.html.”

The link appears 3 times in the article. On page e96 in the last sentence of the “Abstract,” the sentence should have read: “Our Human Erythroid Maturation database is available at https://cellline.molbiol.ox.ac.uk/eryth/index.html.”

In “Methods” on page e98 in the second sentence of the second paragraph under the heading “Web-accessible database,” the sentence should have read: “The Human Erythroblast Maturation database is available at https://cellline.molbiol.ox.ac.uk/eryth/index.html.”

In the third paragraph of “Acknowledgments” on page e107, the sentence should have read: “The Human Erythroblast Maturation (HEM) Database is available at: https://cellline.molbiol.ox.ac.uk/eryth/index.html.”

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