This class contains the pathways of biosynthesis of each of the 21 amino acids present normally in proteins.
superpathway of aromatic amino acid biosynthesis,
superpathway of branched amino acid biosynthesis,
superpathway of L-aspartate and L-asparagine biosynthesis,
superpathway of L-lysine, L-threonine and L-methionine biosynthesis I,
superpathway of L-serine and glycine biosynthesis I
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