Fig. 5 in How to build a larval body with less than a hundred cells? Insights from the early development of a stalked jellyfish (Staurozoa, Cnidaria)

Fig. 5 Morphological differentiation of the AP body axis: beginning of endoderm cell reshaping. CLSM of phallacidin staining (a, b, f, g) and TEM (c–e, h–j). Ectoderm cells are artificially colored in green (rounded basiepithelial cells are in cyan) and endoderm cell are artificially colored in purple on the TEM images. (a–e) Primary elongation of endoderm cells. (a) Very beginning of the axis development: some endoderm cells start elongating. (b) Embryos at a bit later stage: longitudinal section (left) and cross section (right). Endoderm cells are elongated perpendicular to the body axis. As they are packed in two rows, only two or three cells (asterisks) are visible on a cross section. Rounded cells lacking the contact with the embryo surface appear in the ectoderm. (c) An embryo at the same stage as on (b), longitudinal section. Purple arrows show the direction of elongation of the endoderm cells. Note plenty of vacuoles in their cytoplasm. (d) The endoderm core with characteristic pairwise arrangement of cells. (e) Ultrastructure of an endoderm cell. A purple double-