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The -NH2 group is called an amino group.

All the amino acids found in proteins are alpha amino acids. Of the 20 amino acids that are coded for by DNA, 19 have an -NH2 group on the alpha carbon (the carbon adjacent to the carboxyl group). The other amino acid, proline, is similar but the N contributes to a ring formed with the side-chain, and is therefore -NH- .

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Which atoms in all of the amino acids frin the amino portion of the molecule?

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no unless yes is the right answer