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#simplest amino acid #amino acid structure #biochemistry #first amino acid #basic building block

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#essential amino acid #amino acid structure #biochemistry #peptide chain

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#phenylalanine #aromatic amino acid #diet #protein #amino acid structure #C9H11NO2

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#hydrogen side chain #amino acid structure #nitrogen containing #chemical structure #simplest r group

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#amino acid structure #valine cysteine glycine #peptide pattern #VCG code #molecular chain representation #protein sequence symbols