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Amino acids are chemical compounds containing mainly carbon (C), hydrogen (H), oxygen (O) and nitrogen (N). Other elements, such as sulfur (S) are encountered in some amino acids, as well other organic groups, such as aromatic rings.
Many amino acids are chiral.
- Monocarboxylic amino acids: glycine, serine, etc.
- Polycarboxylic amino acids: aminomalonic acid, glutamic acid, etc.
- Polyaminic amino acids: arginine, ornithine, etc.
Amino acids can be obtained from various biological cultures and tissues, though it's a lot cheaper to just buy the desired amino acid.