Cultures of 7002 were inoculated at an initial OD730 of 0.1 from stationary precultures in media A+ with indicated concentrations of phosphate as KH2PO4. Cultures were incubated in 25mL shake flasks as stated above in a custom Kuhner shaking incubator at 37˚C with 250µE/m 2 /s light intensity and 1% constant CO2 atmosphere. For sampling, flask weight was recorded at the beginning of each experiment, then reweighed at each time point. Sterile filtered water was added to account for evaporation by weight, and 1mL was removed at each time point, adjusting the flask weight by assuming 1mL = 1g. Samples were centrifuged at 6,000 g for 1 minute and spent media removed. Pellets and spent media were stored at -20˚C until analysis.