what will happen if RBC have mitochondria
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Most mitochondrial proteins are encoded by nuclear DNA, so a mitochondrion present in a cell without a nucleus (such as RBCs) would lack most of its primary functional and structural elements.
As a result, the redundant mitochondria would either:
be spotted and successfully destroyed via mitophagy (although I doubt such processes are possible in a highly specialized RBC)
continue to live on and reduce the oxygen carrying potential of the RBC by out-competing the cell for oxygen and taking up valuable space which would otherwise be used for packing in haemoglobin.
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