B: Box plot showing gene expression levels of WT, Cnot6l-/- and Btg4-/- oocytes at the MII stage. Genes were divided into 10 bins according to their expression levels in the WT MII oocytes. The box indicates upper and lower quantiles, the thick line in the box indicate the median, and the whiskers represent 2.5th and 97.5th percentiles. ***P < 0.001 by two-tailed Student"s t test. n.s.: non-signif 