What is the counterpart for an aliphatic amino acid in the three letters code?

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M. Eugenio Vazquez

Check this paper from the IUPAC-IUB Joint Commission on Biochemical Nomenclature (JCBN). I suspect that there's no standard notation for what you are asking.

Eur. J. Biochem. 1984, 138, 9–37.

Aleksandra Somogyi

thank you! I saw this paper already before. I had the hope tha the code was extended since then...

Haven't seen anything more recent than that.