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There are two structures for this.

The structure of Glycine is a central C with 4 branches, each (COOH), (H), (H) and (NH2).

The structure of Phenylalanine is a central C with 4 branches, each (COOH), (H), (NH2) and (CH2benzene).

A peptide bond joins any two amino acids (including these ones) by the COOH group of one AA to the NH2 of the other AA, so you can see that there are two variations.

benzene-CH2-C(H)(NH2)-C(=O)-NH-C(H)(H)-C(=O)(OH)

or

benzene-CH2-C(H)(COOH)-NH-C(=O)-C(NH2)(H)(H)

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What is the relationship between atomic structure and the electronegativity of an element, specifically focusing on the role of the 3d transition metal Kr?

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