- The 4-carbon acid transported from mesophyll cells may be malate as above, or may be aspartate.
- The 3-carbon acid transported back from bundle-sheath cells may be pyruvate as above, or alanine.
- The enzyme which catalyses decarboxylation in bundle-sheath cells differs. In maize and sugarcane, the enzyme is NADP-malic enzyme, in millet, it is NAD-malic enzyme, and in Panicum maximum it is PEP carboxykinase.
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