Figure 2.

A 3D-rendering of ICPSER single compartments. (A–B) Two compartments (purple and yellow) have been isolated from the intricate weaving of tubules of the ICPSER shown in Figures 1E–F. The common plan for their construction is evident as they are made by the anastomoses of trijunctional tubules outlining parallel and staggered rows (arrows) of polygonal profiles. Magnification bar, 120 nm. (C–D) The same compartments shown in A and B and rotated by 40° on the x-axis allow to better appreciate the regular polygonal arrays outlined by the tubules. Magnification bar, 120 nm. (E–F) Rotation of the compartments shown in A and B by 90° on the x-axis changes the shape of the profiles outlined by the tubules that become quadrangular. Magnification bar, 120 nm.