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Effect of D8 crude extract on the cell viability of Heterosigma akashiwo. Fluorescence microscopy image of algal cells treated with the D8 crude extract for 5 min (A) and the proportions of FDA fluorescence positive cells exposed to different concentrations of the D8 crude extract (B). The scale bar represents 20 μm. ****p < 0.0001 represent significant differences from the control.
