Copyright information:Taken from "Regionalisation of the mouse visceral endoderm as the blastocyst transforms into the egg cylinder"http://www.biomedcentral.com/1471-213X/7/96BMC Developmental Biology 2007;7():96-96.Published online 16 Aug 2007PMCID:PMC1978209.the ICM at the blastocyst stage. They are shown as a fluorescent projection of a confocal z series merged with a transmitted light section, at the early egg cylinder (EEC) stage (A, C, F), E5.5 (B, D, G) and E6.5 (E, H). For each stage, the number of labelled conceptuses considered (n) and the percentage of those with colonisation of the embryonic region only (Emb, A-B), the extra-embryonic region only (Xemb, C-E) or both (Xemb+Emb, F-H) is indicated. Arrowheads point to the embryonic/extra-embryonic junction. Conceptuses are oriented with the anterior pole on the left, whenever it can be identified. Scale bars 20 μm.