KEGG    Glycine, serine and threonine metabolism - Reference pathway Help
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Serine is derived from 3-phospho-D-glycerate, an intermediate of glycolysis [MD:M00030], and glycine is derived from serine [MD:M00031]. Threonine is an essential amino acid, which animals cannot synthesize. In bacteria and plants, threonine is derived from aspartate [MD:M00025].
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