L-Amino Acids

The amino acids have these features in common:
The carboxyl group.
The amino group. (Proline is an imino acid.)
The a-carbon.
The b-carbon. (Glycine has no side-chain.)
The side chain (or R-group). Reset
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Select "D-amino acids" for viewing on the left to compare the different stereochemistries.

The structure diagrams used for the amino acid R-groups are based on this generalized a-amino acid structure (hydrogens not shown):
It shows the carboxyl and amino groups (gray) and the R-group (red) attached to the a-carbon (black square).
For each amino acid, only the R-group and the a-carbon are shown. For example, the structure shown at left corresponds to R = CH3.

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