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Fig. 4. Marginal zone internalization in Xdd1-expressing embryos. (A) Mid-sagittal plane of SIM dataset of a control embryo. (a') Section from the embryo shown in A, 30° off mid-sagittal. (B) Mid-sagittal plane of SIM dataset of a dorsally injected Xdd1 embryo. (b') Section from the embryo shown in B, 30° off from mid-sagittal. (C) Mid-sagittal view of a control embryo hybridized to Xnot (yellow arrowhead indicates the anterior limit of Xnot staining; green arrowheads indicate blastopore lips). (D) Mid-sagittal cleavage of a circumferentially injected Xdd1 embryo hybridized to Xnot. Ridge of internalized tissue (red arrowheads) is Xnot positive.