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Direct cost ratios, using Experiment #3 as a reference (ref.), in terms of (a) PspA4Pro (ref. US$ 96.5/kgPspA4Pro) and (b) biomass (ref. US$ 11.9/kgDCW).*The Tukey test was performed to evaluate statistical differences, considering standard deviations and a p value <0.05 as significant. ns: not significant.
