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A. General ultrastructure. The cell wall is surrounded by extracellular matrix (arrowheads). Arrows indicate astaxanthin granules. B. Chloroplast and pyrenoid. C. High-magnification view of astaxanthin granules (arrows). D, E. One-layer thylakoids with a regular arrangement. C, chloroplast; CW, cell wall; N, nucleus; P, pyrenoid. Scale bars in A and B–E: 5 µm and 1 µm, respectively.
