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... > LIFE SCIENCES > biology > biochemistry > biochemistry by substance > biochemical substances by composition or structure > proteins, peptides and amino acids > amino acids > nonessential amino acids > cystine

... > PHYSICAL SCIENCES > chemistry > chemical substances > chemical substances by property > acids > organic acids > carboxylic acids > amino acids > nonessential amino acids > cystine

... > PHYSICAL SCIENCES > chemistry > chemical substances > chemical elements and compounds > inorganic compounds > organic compounds > organic compounds by functional group > carbonyl compounds > organic acids > carboxylic acids > amino acids > nonessential amino acids > cystine