In which group are all the amino acids closely interrelated metabolically?

Question

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Ornithine, proline, arginine, and glutamate are all closely interrelated metabolically in the urea cycle, the pathway that converts toxic ammonia into urea for excretion by the kidneys. These amino acids are involved in various steps of the cycle, and their metabolism is tightly regulated to maintain proper nitrogen balance in the body. The other groups of amino acids listed do not share such a close metabolic relationship.

In Which Group Are All the Amino Acids Closely Interrelated