Phosphorylation of p27^Kip1 on serine 10 is required for its binding to CRM1 and nuclear export.

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Fig. 1B contained two errors. The image used to represent the anti-α-tubulin immunoblot for the cytoplasmic fraction from NIH 3T3 cells was duplicated and also used to represent the anti-α-tubulin immunoblot from the whole cell lysates of these cells. In addition, the image used to represent the anti-cyclin D₂ immunoblot for the whole cell lysates from NIH 3T3 cells that were treated with MG132 (data not shown) was also used to represent the anti-cyclin D₂ immunoblot from untreated cells. The correct anti-α-tubulin and anti-cyclin D₂ data for the whole cell lysates of NIH 3T3 cells are shown below. These corrections do not affect the interpretation of the results or the conclusions of this work.