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Growth, lipid accumulation, and fatty acid compositions of P. donghaiense under N- and P-deficient conditions. (A) Growth and lipid accumulation of P. donghaiense under different conditions. (B) Photographs of algal cells under different conditions. Lipid droplets were stained with Nile red and observed with a fluorescence microscope. The values are the means ±SDs (n = 3). *, P < 0.05; **, P < 0.01; ***, P < 0.001; ****, P < 0.0001; *****, P < 0.00001 versus the control.
