Animals are dependent on preformed alpha-amino nitrogen as an essential nutrient.

@article{Katagiri2002AnimalsAD,
  title={Animals are dependent on preformed alpha-amino nitrogen as an essential nutrient.},
  author={Masayuki Katagiri and Masahiko Nakamura},
  journal={IUBMB life},
  year={2002},
  volume={53 2},
  pages={125-9}
}
It has traditionally been thought that animals can utilize ammonia for amino acid biosynthesis, and that for them some amino acids are nutritionally nonessential. Presumably this idea originates from the notions of Schoenheimer (G. L. Foster et al. [1939] J. Biol. Chem. 127, 319-327) and of Rose (W. C. Rose et al. [1948] J. Biol. Chem. 176, 753-762), which we question for the following reasons. First, Schoenheimer's experiments only showed the incorporation of ammonia into amino acids. This may… CONTINUE READING