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The responses of lipid biomarker ratios (mean ± SE) to temperature, N:P supply ratios and nutrient concentrations in the bicultures of Phaeodactylum tricornutum and Prorocentrum minimum: (A) 16:1/16:0, (B) EPA/DHA, and (C) the ratios of brassicasterol/epi-brassicasterol to (brassicasterol/epi-brassicasterol + dinosterol) [B/(B + D)].
