Cover Photograph: Immuno‐staining of 4/32‐cells. Dissociated 1/8‐cells were cultured until they reach 4/32‐cells. These formed small cell clusters resembling blastocyst. Cells surrounding the cyst expressed Cdx2 (red), but the expression of Nanog (green) did not show correlation with cellular position in the cyst. (December 2015) - Unknown