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The order of the second and third authors was reversed. Ying Xu should be the second author and Jason G. Cyster should be the third author. The correct citation is: Pereira JP, Xu Y, Cyster JG (2010) A Role for S1P and S1P1 in Immature-B Cell Egress from Mouse Bone Marrow. PLoS ONE 5(2): e9277. doi:10.1371/journal.pone.0009277
Competing Interests: No competing interests declared.
