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Structure of the rimoportula. Left is a series of image sections through a rimoportula (left to right, up to down), sectioning depth was 10 nm. Arrows in some of the images denote the location of accessory pores in the rimoportula chamber. Right is a 3D reconstruction of the portula highlighting the surface (red) or interior (pale pink) structure viewed from the outside (upper) and inside (lower) of the valve.
