Cover Picture

Confocal slice through a 16‐cell stage mouse embryo outlined by the filamentous actin staining shown in white. Cyan shows the trophectoderm marker Cdx2, which expression is controlled by nuclear Yap shown in red. By the end of the 16‐cell stage, cells have adopted either inner or outer positions which control the sub cellular localisation of Yap and expression of Cdx2.