Correction to: Nature https://doi.org/10.1038/nature14097, published online 22 January 2015.
In Figs. 2b, 3a and 4c of this Article, oocytes were collected in several batches (each batch being the oocytes obtained from one female mouse), but statistical analysis was performed by inappropriately dividing the oocytes into three equal groups, indicated as three independent experiments (see Supplementary Fig. 1 to this Amendment). The corrected graphs, in which statistical analysis was performed among the total oocytes from pooled batches (n = oocyte number), are shown in Figs. 1, 2 and 3 of this Amendment, respectively. The corrected figure legends, including the number of oocytes, are also shown here. See Supplementary Information to this Amendment for the corrected Source Data files for Figs. 2b, 3a and 4c. These corrections do not change the conclusions derived from the experiments, and the original Article has not been corrected online. We apologize for any confusion that this error may have caused.
Supplementary Information is available in the online version of this Amendment.
This figure illustrates how the oocytes were inappropriately divided into three equal groups.
This file contains corrected source data for figure 2b.
This file contains corrected source data for figure 3a.
This file contains corrected source data for figure 4c.