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Carbon metabolism in darkness in relation to δ13C of leaf-respired CO2. δ13C values of metabolites are those measured in French bean leaves. δ13C of CO2 in brackets are derived from positional δ13C values in natural Glc as given by Rossmann et al. (1991). PEPC, Phosphoenolpyruvate carboxylase; KC, Krebs cycle. The symbol “?” points out the uncertainty about the amplitude of the PEPC reaction in darkness.
