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Rates of CO2 fixation in response to varying intercellular levels of CO2 at 21% O2, 25 °C, and a PPFD of 900 μmol quanta m−2 s−1 in Portulaca cryptopetala, P. oleracea, and Sesuvium portulacastrum. The results represent the average from measurements of the response to changes in CO2 (from ambient to low, and low to high) from separate measurements on 2–3 leaves from different plants.
