Relative abundance of protein subunits related to photosynthesis, TAGs biosynthesis, and nitrogen assimilation in P. tricornutum under nitrogen-replete and -stressed conditions. The protein subunits are D1 (core protein of PSII), the large subunit of ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCo, RbcL), type 2 diacylglycerol acyltransferase (DGAT2D), and nitrate reductase (NR). n = 3. Error bars represent ±1 SD.