On page 43 in the 3 July 2014 issue, there is an error in the text. The first sentence of “Methods” reads, “Peripheral blood was obtained from asymptomatic, untreated CLL patients.” However, a subset of the patients (25% in the cohort used for this study) had been treated prior to sample collection, and therefore that sentence should have read, “Peripheral blood was obtained from CLL patients.” ZAP-70 expression did not vary over time, and no conclusions from this study are affected.

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