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Ultrastructure of cells during N limitation. Electron micrographs of a representative CC-125 cell grown in medium containing 10 mM NH4+ (0d) and representative cells switched to 0 mM NH4+ and grown for 1 (1d), 2 (2d), or 3 (3d) days, respectively, are shown. Scale bars represent 2 μm. E, eyespot; LD, lipid droplets; N, nucleus; P, pyranoid; S, starch granules; T, thylakoid membranes; V, vacuoles.
