3D representation of cell shapes and localization CBs observed before, during and after embryonic inversion. The localization of the different cell shapes within the embryo is indicated in Figure 13.(A1 to A4) Teardrop-shaped cells: radially symmetrical cells that are cone shaped at the flagellar ends but have hexagonal cross-sections at the chloroplast ends (Figure 13A, B, C, D). (B1 to B4) Spindle-shaped cells: radially symmetrical, elongated cells with pointed ends on both sides (Figure 13B, C, D, E). (C1 to C4) Disc-shaped cells: elongated, flat cells that partially overlap each other; (C1a) broad and (C1b) narrow side of the cell (Figure 13C, D, E, F, GH). (D1 to D4) Paddle-shaped cells: elongated cells that are pointed and radially symmetrical only at the flagellar ends but wedge shaped at the chloroplast ends (Figure 13C, D); (D1a) broad and (D1b) narrow side of the cell. (E1 to E4) Pencil-shaped cells: radially symmetrical, elongated cells that are pointed at the flagellar ends and flattened at the chloroplast ends (Figure 13E, F, G, H). (F1 to F4) Column-shaped cells: radially symmetrical, elongated cells that are flattened at the chloroplast ends and rounded at the flagellar ends (Figure 13I). (G1 to G4) Gemstone-shaped cells: radially symmetrical cells that are shaped like flat cones at the flagellar ends but have hexagonal cross-sections at the chloroplast ends.(A1 to G1) Wire frame models; cell sizes and the flagellar (fla) and chloroplast (chl) ends of the cells are indicated. All other parts of the figure depict the in vivo arrangement of the cells (with a green surface texture) from different viewing directions. The positions of CBs are indicated by red connections between cells. (A2 to G2) Frontal side view. (A3 to G3) View of the chloroplast ends. (A4 to G4) Slanted side view. Arrows indicate the viewing directions in other parts of the figure. CB: cytoplasmic bridge.
Höhn and Hallmann BMC Biology 2011 9:89 doi:10.1186/1741-7007-9-89