The primary carboxylation product of the C4 cycle is oxaloacetate, a four-carbon acid formed when PEP carboxylase fixes carbon dioxide to phosphoenolpyruvate (PEP) in the mesophyll cells. Oxaloacetate is then converted to other four-carbon compounds like malate or aspartate and transported to bundle sheath cells, where the carbon dioxide is released to enter the Calvin cycle.
The carboxylation products of the C4 cycle are _______?
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