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. 2013 Jan 11;8(1):e53618. doi: 10.1371/journal.pone.0053618

Figure 4. Transmission electron micrographs of H. pluvialis cyst cells.

Figure 4

A. General ultrastructure of cyst cells, showing small granules that contain astaxanthin. B. General ultrastructure of a cyst cell, showing astaxanthin accumulation in oil droplets. C. General ultrastructure of a cyst cell, showing large oil droplets. Chloroplasts localize in the interspace between oil droplets (arrows). D. Some oil droplets are fused. E. High-magnification view of chloroplasts. C, chloroplast; N, nucleus; OD, oil droplet. Scale bars in A–D and E: 5 µm and 0.5 µm, respectively.