On page 3954 in the April 23, 2009, issue, in the first sentence of the third paragraph under the heading “Sampling and cell isolation,” the authors omitted information about collection of human amniotic fluid (AF) samples. The correct sentence should read: Human AF was collected from consenting volunteer donors according to guidelines from the Ethical Committee of the Centre Hospitalier Universitaire Le Kremlin Bicêtre (Kremlin Bicêtre, France), either from terminations of pregnancy (before 15 weeks of gestation) or during routine diagnostic procedures (amniocentesis).

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