Fig. 7
From: An intimate view into the silica deposition vesicles of diatoms
Morphogenesis of cribrum pores in T. pseudonana. Images a–c show TEM micrographs from valve SDVs in different developmental stages, and images a′–c′ show schematics of the same developmental stages. The arrowheads point to features that are described in the text. Scale bars: 200 nm