Multiple choice

Which of the following is a pair of non-protein amino acids only?

  1. Ornithine and Citrulline

  2. Glycine and Tyrosine

  3. Valine and Arginine

  4. Ornithine and Tyrosine

  5. Arginine and Citrulline

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A Correct answer
Explanation

Ornithine and Citrulline: Non-protein amino acids.