Fig. 9

Transmission electron microscopy image of a single cell of a P. californica young adult shortly after release from its mother spheroid. Heavy metal-stained section of a P. californica young adult, which was fixed a short time after release from its mother spheroid; the image shows a picture detail with a single cell at high magnification; the spherical cell is enclosed in a newly synthesized embryonic vesicle (EV) and it is embedded in a considerable amount of extracellular matrix (ECM) material. N: nucleus; P: pyrenoid. Scale bar: 5 μm