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Fig. 6. Localisation of activated ERK in a 32-cell stage embryo. (A) Vegetal view. The labelled cell is one of the four macromeres. (B) Side view of the same embryo. The labelled cell is contacting the blastocoel roof, and thus can be identified as 3D. Labelling is strong in the nucleus (arrow) and along the zone of contact with the cap of micromeres (arrowhead).