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An individual has been shown to have a deficiency in an intestinal epithelial cell amino acid transport system for leucine. However, the individual shows no symptoms of amino acid deficiency. This could be because of which of the following?
A.
The body synthesizes leucine to compensate for the transport defect.
B.
The kidney reabsorbs leucine and sends it to other tissues.
C.
There are multiple transport systems for leucine.
D.
Isoleucine takes the place of leucine in proteins.
E.
Leucine is not necessary for bulk protein synthesis.