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  2. Amino acid - Wikipedia

    en.wikipedia.org/wiki/Amino_acid

    Structure of a typical L-alpha-amino acid in the "neutral" form. Amino acids are organic compounds that contain both amino and carboxylic acid functional groups. [1] Although over 500 amino acids exist in nature, by far the most important are the 22 α-amino acids incorporated into proteins. [2] Only these 22 appear in the genetic code of life ...

  3. Stable isotope composition of amino acids - Wikipedia

    en.wikipedia.org/wiki/Stable_isotope_composition...

    The stable isotope composition of amino acids refers to the abundance of heavy and light non-radioactive isotopes of carbon (13 C and 12 C), nitrogen (15 N and 14 N), and other elements within these molecules. Amino acids are the building blocks of proteins. They are synthesized from alpha-keto acid precursors that are in turn intermediates of ...

  4. List of amino acids - Wikipedia

    en.wikipedia.org/wiki/List_of_amino_acids

    Amino acids are listed by type: Proteinogenic amino acid; Non-proteinogenic amino acids This page was last edited on 5 ...

  5. Lists of molecules - Wikipedia

    en.wikipedia.org/wiki/Lists_of_molecules

    This is an index of lists of molecules (i.e. by year, number of atoms, etc.). Millions of molecules have existed in the universe since before the formation of Earth. Three of them, carbon dioxide, water and oxygen were necessary for the growth of life.

  6. D-Amino acid - Wikipedia

    en.wikipedia.org/wiki/D-Amino_acid

    D-Amino acids are occasionally found in nature as residues in proteins. They are formed from ribosomally-derived D-amino acid residues. [1] Amino acids, as components of peptides, peptide hormones, structural and immune proteins, are the most important bioregulators involved in all life processes along with nucleic acids, carbohydrates and lipids.

  7. Protein primary structure - Wikipedia

    en.wikipedia.org/wiki/Protein_primary_structure

    Protein primary structure is the linear sequence of amino acids in a peptide or protein. [1] By convention, the primary structure of a protein is reported starting from the amino -terminal (N) end to the carboxyl -terminal (C) end.

  8. Category:Amino acids - Wikipedia

    en.wikipedia.org/wiki/Category:Amino_acids

    An amino acid is any molecule that contains both amino and carboxylic acid functional groups. Subcategories. This category has the following 18 subcategories, out of ...

  9. Arginine - Wikipedia

    en.wikipedia.org/wiki/Arginine

    Arginine is an essential amino acid for birds, as they do not have a urea cycle. [19] For some carnivores, for example cats, dogs [ 20 ] and ferrets, arginine is essential, [ 3 ] because after a meal, their highly efficient protein catabolism produces large quantities of ammonia which need to be processed through the urea cycle, and if not ...